形容詞 caducous:

1. shed at an early stage of development
   同義詞：shed

ca.du.cous

adj.（形容詞）
Dropping off or shedding at an early stage of development, as the gills of most amphibians or the sepals or stipules of certain plants.
脫落：大多數(shù)兩棲動(dòng)物在其生長(zhǎng)過(guò)程中早期具有的褪皮現(xiàn)象，某些植物的花萼或托葉的脫落

來(lái)源：
From Latin cadôcus [falling]
源自 拉丁語(yǔ) cadôcus [落下]
from cadere [to fall] * see kad-
源自 cadere [掉落] *參見(jiàn) kad-