n. [ acronym ] (Med.) same as
blood urea nitrogen; the concentration of nitrogen in blood present in the form of urea; -- used as a measure of kidney function. Blood usually contains 10 to 15 mg of nitrogen per 100 ml in the form of urea. Stedman. [ PJC ]

n. [ trademark. ] a synthetic rubber made by copolymerizing butadiene with another substance such as acrylonitrile or styrene.
Syn. -- buna-S. [ WordNet 1.5 ]

n. a sudden unexpected piece of good fortune.
Syn. -- windfall, gravy, godsend. [ WordNet 1.5 ]

v. t. To form into a bunch or bunches. [ 1913 Webster ]

v. i. [ imp. & p. p. Bunched p. pr. & vb. n. Bunching. ] To swell out into a bunch or protuberance; to be protuberant or round. [ 1913 Webster ]

Bunching out into a large round knob at one end. Woodward. [ 1913 Webster ]

n. [ Akin to OSw. & Dan. bunke heap, Icel. bunki heap, pile, bunga tumor, protuberance; cf. W. pwng cluster. Cf. Bunk. ] 1. A protuberance; a hunch; a knob or lump; a hump. [ 1913 Webster ]

They will carry . . . their treasures upon the bunches of camels. Isa. xxx. 6. [ 1913 Webster ]

2. A collection, cluster, or tuft, properly of things of the same kind, growing or fastened together; as, a bunch of grapes; a bunch of keys. [ 1913 Webster ]

3. (Mining) A small isolated mass of ore, as distinguished from a continuous vein. Page. [ 1913 Webster ]

a. Having a bunch on the back; crooked. “Bunch-backed toad.” Shak. [ 1913 Webster ]

n. (Bot.) The dwarf cornel (Cornus Canadensis), which bears a dense cluster of bright red, edible berries. [ 1913 Webster ]

(Bot.) A grass growing in bunches and affording pasture. In California, Atropis tenuifolia, Festuca scabrella, and several kinds of Stipa are favorite bunch grasses. In Utah, Eriocoma cuspidata is a good bunch grass. [ 1913 Webster ]

n. The quality or condition of being bunchy; knobbiness. [ 1913 Webster ]