CADUCOUS

adj. falling off at an early stage of development (Biology)

Adjective
1. shed at an early stage of development; "most amphibians have caducous gills"; "the caducous calyx of a poppy"
(synonym) shed
(antonym) persistent, lasting
(similar) deciduous
(classification) biology, biological science

Dropping off or disappearing early, as the calyx of a poppy, or the gills of a tadpole.
  

caducous /kə'dju:kəs/
tính từ già cỗi, suy nhược hư nát (thực vật học) sớm rụng chóng tàn, không bền
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CADUCO. EFFIMERO. TRANSEUNTE