From The Collaborative International Dictionary of English v.0.48:
Bull \Bull\, n. [OE. bule, bul, bole; akin to D. bul, G. bulle, Icel. boli, Lith. bullus, Lett. bollis, Russ. vol'; prob. fr. the root of AS. bellan, E. bellow.] 1. (Zool.) The male of any species of cattle (Bovid[ae]); hence, the male of any large quadruped, as the elephant; also, the male of the whale. [1913 Webster]
Note: The wild bull of the Old Testament is thought to be the oryx, a large species of antelope. [1913 Webster]
2. One who, or that which, resembles a bull in character or action. --Ps. xxii. 12. [1913 Webster]
3. (Astron.) (a) Taurus, the second of the twelve signs of the zodiac. (b) A constellation of the zodiac between Aries and Gemini. It contains the Pleiades. [1913 Webster]
At last from Aries rolls the bounteous sun, And the bright Bull receives him. --Thomson. [1913 Webster]
4. (Stock Exchange) One who operates in expectation of a rise in the price of stocks, or in order to effect such a rise. See 4th Bear, n., 5. [1913 Webster]
5. a ludicrously false statement; nonsense. Also used as an expletive. [vulgar]
Syn: bullshit, Irish bull, horseshit, shit, crap, crapola, bunk, bunkum, buncombe, guff, nonsense, rot, tommyrot, balderdash, hogwash, dogshit. [WordNet 1.5]
Bull baiting, the practice of baiting bulls, or rendering them furious, as by setting dogs to attack them.
John Bull, a humorous name for the English, collectively; also, an Englishman. "Good-looking young John Bull." --W. D.Howells.
To take the bull by the horns, to grapple with a difficulty instead of avoiding it. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Bull \Bull\, a. Of or pertaining to a bull; resembling a bull; male; large; fierce. [1913 Webster]
Bull bat (Zool.), the night hawk; -- so called from the loud noise it makes while feeding on the wing, in the evening.
Bull calf. (a) A stupid fellow.
Bull mackerel (Zool.), the chub mackerel.
Bull pump (Mining), a direct single-acting pumping engine, in which the steam cylinder is placed above the pump.
Bull snake (Zool.), the pine snake of the United States.
Bull stag, a castrated bull. See Stag.
Bull wheel, a wheel, or drum, on which a rope is wound for lifting heavy articles, as logs, the tools in well boring, etc. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Bull \Bull\, v. i. To be in heat; to manifest sexual desire as cows do. [Colloq.] [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Bull \Bull\, v. t. (Stock Exchange) To endeavor to raise the market price of; as, to bull railroad bonds; to bull stocks; to bull Lake Shore; to endeavor to raise prices in; as, to bull the market. See 1st Bull, n., 4. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Bull \Bull\, n. [OE. bulle, fr. L. bulla bubble, stud, knob, LL., a seal or stamp: cf. F. bulle. Cf. Bull a writing, Bowl a ball, Boil, v. i.] 1. A seal. See Bulla. [1913 Webster]
2. A letter, edict, or respect, of the pope, written in Gothic characters on rough parchment, sealed with a bulla, and dated "a die Incarnationis," i. e., "from the day of the Incarnation." See Apostolical brief, under Brief. [1913 Webster]
A fresh bull of Leo's had declared how inflexible the court of Rome was in the point of abuses. --Atterbury. [1913 Webster]
3. A grotesque blunder in language; an apparent congruity, but real incongruity, of ideas, contained in a form of expression; so called, perhaps, from the apparent incongruity between the dictatorial nature of the pope's bulls and his professions of humility. [1913 Webster]
And whereas the papist boasts himself to be a Roman Catholic, it is a mere contradiction, one of the pope's bulls, as if he should say universal particular; a Catholic schimatic. --Milton. [1913 Webster]
The Golden Bull, an edict or imperial constitution made by the emperor Charles IV. (1356), containing what became the fundamental law of the German empire; -- so called from its golden seal. [1913 Webster]
Syn: See Blunder. [1913 Webster]