资料来源 : pyDict

每年落叶的,非永久性的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

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.

资料来源 : WordNet®

deciduous
     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"