- Falling off, or subject to fall or be shed, at a certain
season, or a certain stage or interval of growth, as leaves (except of
evergreens) in autumn, or as parts of animals, such as hair, teeth,
antlers, etc.; also, shedding leaves or parts at certain seasons,
stages, or intervals; as, deciduous trees; the deciduous membrane.
Meaning of 'deciduous' (Princeton's WordNet)
1 . deciduous
[ s]
Meaning (1): - (of teeth, antlers, etc.) being shed at the end of a period of growth