BULB n.
A spheroidal body growing from a plant either above or below the ground (usually below), which is strictly a bud, consisting of a cluster of partially developed leaves, and producing, as it grows, a stem above, and roots below, as in the onion, tulip, etc. It differs from a corm in not being solid.
BUR; BURR n. 2 definitions
Any rough or prickly envelope of the seeds of plants, whether a pericarp, a persistent calyx, or an involucre, as of the chestnut and burdock. Also, any weed which bears burs. Amongst rude burs and thistles. Milton. Bur and brake and brier. Tennyson.
BUTTER n.
of cacao, vegetable butter, shea butter. Butter and eggs (Bot.), a name given to several plants having flowers of two shades of yellow, as Narcissus incomparabilis, and in the United States to the toadflax (Linaria vulgaris). -- Butter boat, a small vessel for holding melted butter at table. -- Butter flower, the bu…