de·cid·u·ous /dɪˈsɪʤəwəs/ 形容詞
De·cid·u·ous a. 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.
adj 1: (of plants and shrubs) shedding foliage at the end of the
growing season [ant: evergreen]
2: (of teeth, antlers, etc.) being shed at the end of a period
of growth; "deciduous teeth"