Dictionary![]() ![]() hy•per•pla•siaPronunciation: (hī"pur-plā'zhu, -zhē-u, -zē-u), [key] —n. Pathol., Biol. 1. abnormal multiplication of cells. 2. enlargement of a part due to an abnormal numerical increase of its cells. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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