- [Bot] A small protuberance on the stem or branches of a plant, containing the rudiments of future leaves, flowers, or stems; an undeveloped branch or flower.
- [Biol] A small protuberance on certain low forms of animals and vegetables which develops into a new organism, either free or attached. See Hydra.
Etymology: OE. budde; cf. D. bot, G. butze butz, the core of a fruit, bud, LG. butte in hagebutte, hainbutte, a hip of the dog-rose, or OF. boton, F. bouton, bud, button, OF. boter to bud, push; all akin to E. beat. See Button