'Deciduous' definitions:

Definition of 'deciduous'

From: WordNet
adjective
(of plants and shrubs) shedding foliage at the end of the growing season [ant: evergreen]
adjective
(of teeth, antlers, etc.) being shed at the end of a period of growth; "deciduous teeth"

Definition of 'Deciduous'

From: GCIDE
  • Deciduous \De*cid"u*ous\ (?; 135), a. [L. deciduus, fr. dec?dere to fall off; de- + cadere to fall. See Chance.] (Biol.) 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. [1913 Webster]