cup-shaped structure of hardened bracts at the base of an acorn
a sucker on the feet of certain flies
例句
用作名词 (n.)
The nuts were originally described as being separate from the cupules except for the basal part, but the authors found a considerable portion of the nut to be adnate to the cupule. 原描述说坚果除基部外均与壳斗离生，但作者发现相当多的坚果是与壳斗贴生的。
美
['kjuːpjuːl]
