scale leaf🔊noun1Biology, Botany, Natural sciences A small flat leaf resembling a scale, such as on many conifers.An individual flower that is subtended by a scale leaf at its junction with the stem of a plant; a rudimentary leaf.2Biology, Botany, Natural sciences A small modified leaf, especially a colorless membranous one, such as on a rhizome or forming part of a bulb.Related termsfoliage, frond, needle