形容詞 deciduous:

1. (of plants and shrubs) shedding foliage at the end of the growing season
2. (of teeth, antlers, etc.) being shed at the end of a period of growth

de.cid.u.ous

adj.（形容詞）
Falling off or shed at a specific season or stage of growth:
脫落的：在特定季節(jié)或成長(zhǎng)期脫落的：
例句：
deciduous antlers; deciduous leaves; deciduous teeth.
脫落的鹿角；落葉；脫落的牙齒

Shedding or losing foliage at the end of the growing season:
落葉的：在生長(zhǎng)期結(jié)束時(shí)落葉的：
例句：
deciduous trees.
落葉樹

Not lasting; ephemeral.
暫時(shí)的：非永久的；短暫的

來源：
From Latin dôciduus
源自 拉丁語 dôciduus
from dôcidere [to fall off]
源自 dôcidere [脫落]
dô- [de-]
dô- [前綴，表.去除，移開.]
cadere [to fall] * see kad-
cadere [落] *參見 kad-

【引伸】
decid.uously
adv.（副詞）
decid.uousness
n.（名詞）