This page gathers the 9,272 dictionary entries belonging to the domain “Biology”, as labelled by Wiktionary. Each word leads to its full entry: definitions, etymology, pronunciation, examples. Page 88 of 93: from “trenchant” to “tuberin”.
- trenchant adj Adapted for tearing into flesh.
- triadelphous adj Having its stamens fused together at least partly by the filaments so that they form three separate groups, some of which may contain a…
- triaulic adj Having three reproductive duct systems, one for the deposit of sperm, one for receiving sperm, and one for depositing eggs.
- tribal adj Phylogenic.
- tribe noun A group of apes who live and work together.
- tribosphenic adj Describing the original placental molars that have a talonid in the lower molar teeth, where the protocone of the upper teeth hits.…
- trica noun An apothecium in certain lichens, having a spherical surface marked with spiral or concentric ridges and furrows.
- trichite noun A delicate, hair-like siliceous spicule, found in certain sponges.
- trichiuriform adj Like or pertaining to the genus Trichiurus or family Trichiuridae, comprising the scabbardfishes and hairtails.
- trichobranchia noun The gill of a crustacean in which the branchial filaments are slender and cylindrical, as in the crawfishes.
- trichogyne noun The slender, hair-like cell which receives the fertilizing particles, or antherozoids, in female red seaweeds, lichens and fungi.
- trichohyalin noun A protein in humans that confers mechanical strength on the hair follicle's inner root sheath and other toughened epithelial tissues, such…
- tricholomatoid adj Describes any mushroom with notched gill attachment, a thick fleshy stem and lacking an annulus or volva.
- trichome noun A hair- or scale-like extension of the epidermis of a plant.
- trichonodelliform adj Bilaterally symmetrical with lateral processes on each side of the cusps, and with a posterior process. Applied to conodont elements.
- trichophore noun The special cell in red algae which produces or bears a trichogyne.
- trichophyte noun Any organism of the fungus genus Trichophyton.
- trichrome noun A combined stain that stains three different tissues three different colours.
- tricolpate adj Having three grooves, or colpi, on each grain.
- triculture noun A coculture containing three different types of cells.
- tricussate adj Having whorls of three leaves each, the leaves of each whorl alternating with those above and below.
- tricyclic adj Of a flower: composed of three whorls or organs.
- tridactyl adj Composed of three movable parts attached to a common base.
- tridentate adj Having tooth-like projections that are themselves bidentate.
- trifoliate adj Having or comprising three leaves, or (loosely) trifoliolate (with three leaflets) or having leaves with three parts, as the clover plant.
- trifoliolate adj Having three leaflets, as some compound leaves do.
- trig noun A cricket in the family Trigonidiidae.
- trigamous adj Having three kinds of flowers — male, female, and hermaphrodite — in the same flower head.
- trigon noun The cusp (cutting region) of the crown of an upper molar, usually the anterior part.
- trigone noun One of the thickenings of the cell wall at the angles where several cells join.
- trigonelline noun An alkaloid product of the metabolism of niacin, found in many plants including fenugreek (Trigonella foenum-graecum).
- triiodothyronine noun A thyroid hormone, with the chemical formula C₁₅H₁₂I₃NO₄, affecting almost every process in the body, including body temperature, growth…
- trilobular adj Having three lobules.
- trimerous adj Organized in threes; having parts in numbers that are multiples of three.
- trimethylguanosine noun Any trimethyl derivative of guanosine, but especially 2,2,7-trimethylguanosine which inhibits crosslinking of nucleic acids
- trimorphic adj Having three different forms with a clear attribute amongst three animals of the same species.
- trimorphism noun The coexistence among individuals of the same species of three distinct forms, not generally connected by intermediate gradations.
- trinomen noun A scientific name at the rank of subspecies: an expansion of a binomial name (a genus and a species) combined with the name of the…
- trinucleotide repeat disorder noun Any of a group of disorders caused by stretches of DNA that contain a sequence of three nucleotides repeated many times
- trioecious adj Having male (staminate), female (pistillate), and bisexual flowers on the same plant (also known as "polygamous"), like Fraxinus excelsior
- triokinase noun A transferase enzyme that catalyzes the chemical reaction ATP + D-glyceraldehyde ⇌ ADP + D-glyceraldehyde 3-phosphate.
- triose noun A sugar or saccharide containing three carbon atoms. Trioses are the smallest monosaccharides. Dihydroxyacetone and L-/D-glyceraldehyde are…
- triosephosphateisomerase noun An enzyme that catalyzes the reversible interconversion of the triosephosphate isomers dihydroxyacetone phosphate and D-glyceraldehyde…
- triparental adj Involving three parents, but especially describing a form of bacterial conjugation in which a conjugative plasmid present in a "helper"…
- triparted adj Divided nearly to the base into three segments or lobes.
- tripeptide aminopeptidase noun A zinc enzyme, widely distributed in mammalian tissues, that catalyzes the release of the N-terminal residue from a tripeptide.
- triphosphatase noun An enzyme that catalyzes the breakdown of triphosphate into a phosphate and a diphosphate through the addition of a water molecule
- tripinnatifid adj triply pinnately cleft; said of a pinnatifid leaf when its segments are pinnatifid, and the subdivisions of these also are pinnatifid.
- triple-stranded adj That have three helical strands of nucleic acid that wind around each other and are connected by hydrogen bonds.
- triplinerved adj Having three main nerves with the lateral nerves arising from the midnerve above the base of the leaf.
- triploid adj Having three sets of chromosomes.
- triploidy noun The state of being triploid, having three sets of chromosomes.
- tripod noun An organism with three limbs.
- tripus noun The hindmost Weberian ossicle of the Weberian apparatus, touching the anterior wall of the swimbladder and connected by a dense, elongate…
- trisect adj Trisected; divided into three.
- trisoligonucleotide noun An assembly of three short strands of DNA (oligonucleotides) around a branching junction; they have been used to build nanoscale structures
- trisomic adj Having three copies of a given chromosome in each somatic cell instead of the usual number of two
- trispecific adj Relating to or composed of three species.
- triternate adj Three times ternate; applied to a leaf dividedvintovthree stalks, each with three leaflets that divide into three lobes
- tritovum noun An embryonic insect which has twice cast its skin before hatching from the egg, such as some mites of Myobia
- trivalent noun Any trivalent chromosome
- trivial adj Relating to or designating the name of a species; specific as opposed to generic.
- trivial name noun A commonly used, non-systematic name for an organism.
- trivium noun The three anterior ambulacra of echinoderms, collectively.
- trixeny noun The situation where an autoecious parasite may infest three species, but does not need a change of host to ensure its development.
- trochantinian adj Relating to the trochantine
- trochilus noun Any member of the hummingbird genus Trochilus.
- trochoid noun An organism or fossil with a trochoid shell (especially one in the gastropod family Trochidae), or the shell itself.
- trochus noun Any member of the genus Trochus, or more generally of the family Trochidae; in non-specialist usage, including species formerly classified…
- troop noun A group of mushrooms that are close but not close enough to be called a cluster.
- trophic adj Describing the relationships between the feeding habits of organisms in a food chain.
- trophic cascade noun The secondary disruptions that go cascading through a system from which a keystone species has been removed.
- trophoblast noun The membrane of cells that forms the wall of a blastocyst during early pregnancy, providing nutrients to the embryo and later developing…
- trophophoresy noun A form of trophobiosis in which one creature carries another creature to another location to farm it (harvest food from it, often after…
- trophoplast noun Any of various organelles found in plant and algae cells, such as a chloroplast, chromoplast, leucoplast, or gerontoplast; a plastid.
- trophosome noun The group of nutritive zooids of a hydrozoan.
- tropic adj Having the quality of indirectly inducing a biological or chemical change in a system or substrate.
- tropicopolitan adj Found throughout the tropics.
- tropin noun any of the tropic hormones; one that is secreted by an endocrine gland and targets another such gland
- tropism noun The turning of an organism (chiefly a plant) or part of an organism either towards or away from a stimulus; (countable) an instance of this.
- tropomyosin noun A protein involved in muscle contraction and related to myosin, and occurs together with troponin in the thin filaments of muscle tissue.
- troponin noun A heterotrimeric regulatory protein complex found in the thin filaments of striated muscle fibers, including both skeletal and cardiac…
- tropotaxis noun Movement by organisms with paired receptor cells, triggered when the stimuli at the receptors are equally balanced.
- true adj Used in the designation of group of species, or sometimes a single species, to indicate that it belongs to the clade its common name (which…
- true daikon noun The common daikon, to distinguish the principal large, long, and white variety from various other forms such as the watermelon radish.
- true leaf noun Any leaves of a seed plant other than the cotyledons.
- truelove noun A plant, Paris quadrifolia.
- truncate adj Having an abrupt termination.
- truncus noun The thorax of an insect.
- trunk noun The usually single, more or less upright part of a tree, between the roots and the branches.
- truss noun A tuft of flowers or cluster of fruits formed at the top of the main stem of certain plants.
- trypomastigote noun A stage in the unicellular life cycle, typically of trypanosomes, where the flagellum is posterior of the nucleus, and connected to the…
- tryptamine noun A heterocyclic amine found in both plant and animal tissue, where it is an intermediate in several metabolic schemes.
- tryptone noun The assortment of peptides formed by the digestion of casein by trypsin, a protease. Often used in the preparation of lysogeny broth.
- tryptophan noun An essential amino acid with an indole side chain; present in many foods, especially chocolate, oats, banana and milk; it is essential for…
- tryptophan synthase noun An enzyme found in plants and bacteria, but not in animals, which catalyses the final step in the biosynthesis of tryptophan.
- tryptophan synthetase noun An enzyme found in plants and bacteria, but not in animals, which catalyses the final step in the biosynthesis of tryptophan.
- TTN noun The gene that encodes for the protein titin.
- tubercle noun A small rounded wartlike protuberance of the roots of some leguminous plants; the lip of certain orchids, cacti.
- tuberin noun A protein found in potatoes