PLU'MOUS, adjective [Latin plumosus.] Feathery; resembling feathers. 1. In botany, a plumose bristle is one that has hairs growing on the sides of the main bristle. Plumose pappus or down is a flying crown to some seeds, composed of feathery hairs.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI