The Collaborative International Dictionary
Plumula
Plumula \Plu"mu*la\, n.; pl. L. Plumule, E. -las. [L. See Plumule.]
(Bot.) A plumule.
(Zo["o]l.) A down feather.
Wiktionary
plumula
n. 1 (context botany English) A plumule. 2 (context zoology English) A down feather.