Having, or pertaining to a system which involves, three sexes.
Whether three sexes could exist in this contexture, or whether a trisexual organism would be quite different from the organisms we know, it is impossible to say.1937, William Robin Thompson, Science and Common Sense: An Aristotelian Excursion:
Trimates and Three Autos The Trimates are a trisexual race from the planet Tiberon. Each union consists of a Polar, who always tells the truth, a Polee, who makes only false statements, and a Nexus, who makes statements that are […]1982, Roger Hufford, Droid's Dilemma, →ISBN:
1 more example
Earth, a bisexual planet, represents its childhood, Herschel (trisexual), its [the soul's] adolescence, Saturn (trisexual), its maturity, and Jupiter (bisexual), its old age. Eventually the orchestrated symphony leads to the metempsychosis of planets.1983, Nottingham French studies, volumes 22-25, page 34:
trisexual
noun
Etymology From tri- + sexual.
1
An organism (that is, a species) which has three sexes.
Trimates are trisexuals from the planet Tiberon, visiting earth in their flying saucers. Each union consists of a Polar, who always tells the truth; a Polee who always lies; and a Nexus, who makes statements that are […]1982, Roger Hufford, Droid's Dilemma, →ISBN:
trisexual
adj
Etymology From try + sexual, respelled as if using tri- and as if analogous to bisexual.
"I was told he's trisexual." "Quit it!" Alice laughed. "There's no such thing as trisexual." "I guess you don't read the new books, dearie. That's someone who'll try anything." Alice held her nose.1944(?), Louis Paul, A Passion for Privacy
"Yes, and she's trisexual." "Trisexual? What does that mean?" "She'll try anything!"1987, Larry Wilde, The Official Executives Joke Book, Bantam Books, →ISBN:
trisexual
noun
Etymology From try + sexual, respelled as if using tri- and as if analogous to bisexual.