ca·du·cous /kəˈdukəs, ˈdju-/
(a.)早落性的,早謝的,易脫落的
Ca·du·cous Bot. & Zool. Dropping off or disappearing early, as the calyx of a poppy, or the gills of a tadpole.
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caducous
adj : shed at an early stage of development; "most amphibians have
caducous gills"; "the caducous calyx of a poppy" [syn:
shed] [ant: persistent]