bud (n.) Look up bud at Dictionary.com
"undeveloped growth-point of a plant," late 14c., budde, origin unknown, perhaps from Old French boter "push forward, thrust," itself a Germanic word (compare Dutch bot "bud," Old Saxon budil "bag, purse," German Beutel), or perhaps from Old English budd "beetle."
bud Look up bud at Dictionary.com
familiar form of address for a male, 1851, perhaps a shortening of buddy (q.v.) and ultimately from brother.
bud (v.) Look up bud at Dictionary.com
"put forth or produce buds," c. 1400; see bud (n.). Related: Budded; budding.