[ hahy-per-pley-zhuh, -zhee-uh, -zee-uh ]
/ ˌhaɪ pərˈpleɪ ʒə, -ʒi ə, -zi ə /

noun Pathology, Biology.

abnormal multiplication of cells.
enlargement of a part due to an abnormal numerical increase of its cells.

Origin of hyperplasia

First recorded in 1860–65; hyper- + -plasia

Related forms

hy·per·plas·tic [hahy-per-plas-tik] /ˌhaɪ pərˈplæs tɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for hyperplasia

British Dictionary definitions for hyperplasia


/ (ˌhaɪpəˈplæzɪə) /


enlargement of a bodily organ or part resulting from an increase in the total number of cellsCompare hypertrophy

Derived Forms

hyperplastic (ˌhaɪpəˈplæstɪk), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for hyperplasia


[ hī′pər-plāzhə ]


An abnormal increase in cells in a tissue or organ, excluding tumor formation, whereby the bulk of the tissue or organ is increased.

Related forms

hy′per•plastic (-plăstĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.