Bud n.
 1. 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.
 2. Biol. A small protuberance on certain low forms of animals and vegetables which develops into a new organism, either free or attached. See Hydra.
 Bud moth Zool., a lepidopterous insect of several species, which destroys the buds of fruit trees; esp. Tmetocera ocellana and Eccopsis malana on the apple tree.