[hahy-per-pley-zhuh, -zhee-uh, -zee-uh]
noun Pathology, Biology.
abnormal multiplication of cells.
enlargement of a part due to an abnormal numerical increase of its cells.

1860–65; hyper- + -plasia

hyperplastic [hahy-per-plas-tik] , adjective
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World English Dictionary
hyperplasia (ˌhaɪpəˈplæzɪə)
Compare hypertrophy enlargement of a bodily organ or part resulting from an increase in the total number of cells

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American Heritage
Medical Dictionary

hyperplasia hy·per·pla·sia (hī'pər-plā'zhə)
An abnormal increase in cells in a tissue or organ, excluding tumor formation, whereby the bulk of the tissue or organ is increased.

hy'per·plas'tic (-plās'tĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
When the endothelium is damaged, it leads to a condition called intimal hyperplasia--an abnormal growth of smooth muscle cells.
Correcting his enlarged prostate, or benign prostatic hyperplasia, requires a three-day hospital stay.
Hyperplasia is a general medical term referring to an abnormal increase in cells.
The causes of benign prostatic hyperplasia are not fully understood.
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