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A solid or hollow sphere, or roughly spherical mass.
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(mathematics) Homologue or analogue of a disk in the Euclidean plane.
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(ballistics, firearms) A solid, spherical nonexplosive missile for a cannon, rifle, gun, etc.
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A roundish, protuberant portion of some part of the body.
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The globe; the earthly sphere.
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(sports, countable) An object that is the focus of many sports and games, in which it may be thrown, caught, kicked, bounced, rolled, chased, retrieved, hit with an instrument, spun, etc., usually roughly spherical or ovoid but whose size, weight, bounciness, colour, etc. differ according to the game
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(mildly vulgar, slang, usually in the plural) A testicle.
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(printing, historical) A leather-covered cushion, fastened to a handle called a ballstock; formerly used by printers for inking the form, then superseded by the roller.
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(farriery, historical) A large pill, a form in which medicine was given to horses; a bolus.
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(slang, countable, uncountable, singular only) One thousand US dollars.