noun
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a thin sphere of liquid enclosing air etc; a bubble.
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an inflamed pus-filled swelling caused by infection or an abnormal protuberance on or in the body; a boil; a swelling.
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a hard outer covering, as of a mollusc, insect, etc.; a shell.
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a small, circular band of metal, usu. of silver, worn by a married woman on the second toe; a toe-ring.
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anything that is spherical; a ball or ball-like thing.