- 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.
- A small protuberance on certain low forms of animals and vegetables which develops into a new organism, either free or attached. See Hydra.
- To put forth or produce buds, as a plant; to grow, as a bud does, into a flower or shoot.
- To begin to grow, or to issue from a stock in the manner of a bud, as a horn.
- To be like a bud in respect to youth and freshness, or growth and promise; as, a budding virgin.
- To graft, as a plant with another or into another, by inserting a bud from the one into an opening in the bark of the other, in order to raise, upon the budded stock, fruit different from that which it would naturally bear.
- The act or process of producing buds.
- A process of asexual reproduction, in which a new organism or cell is formed by a protrusion of a portion of the animal or vegetable organism, the bud thus formed sometimes remaining attached to the parent stalk or cell, at other times becoming free; gemmation. See Hydroidea.
- The act or process of ingrafting one kind of plant upon another stock by inserting a bud under the bark.