- Botany A small protuberance on a stem or branch, sometimes enclosed in protective scales and containing an undeveloped shoot, leaf, or flower. (noun)
- Botany The stage or condition of having buds: branches in full bud. (noun)
- Biology An asexual reproductive structure, as in yeast or a hydra, that consists of an outgrowth capable of developing into a new individual. (noun)
- Biology A small, rounded organic part, such as a taste bud, that resembles a plant bud. (noun)
- One that is not yet fully developed: the bud of a new idea. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.