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Dictionary


ex•tra•sys•to•le



Pronunciation: (ek"stru-sis'tu-lē), [key]
n. Pathol.
a premature contraction of the heart, resulting in momentary interruption of the normal heartbeat. Also called premature beat, premature contraction.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

extrasolarextraterrestrial
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