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plumule n. 幼芽,棉毛 幼芽,棉毛 plumule n 1: down feather of young birds; persists in some adult birds Plumule \Plu"mule\, n. [L. plumula, dim. of pluma a feather; cf. F. plumule.] 1. (Bot.) The first bud, or gemmule, of a young plant; the bud, or growing point, of the embryo, above the cotyledons. See Illust. of {Radicle}. --Gray. [1913 Webster] 2. (Zool.) (a) A down feather. (b) The aftershaft of a feather. See Illust. under {Feather}. (c) One of the featherlike scales of certain male butterflies. [1913 Webster] Plumula \Plu"mu*la\, n.; pl. L. {Plumule}, E.{-las}. [L. See {Plumule}.] 1. (Bot.) A plumule. [1913 Webster] 2. (Zool.) A down feather. [1913 Webster]
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