[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.

Origin of hyperplasia

First recorded in 1860–65; hyper- + -plasia
Related formshy·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

Historical Examples of hyperplasia

British Dictionary definitions for hyperplasia



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

Word Origin and History for hyperplasia

1861, from Modern Latin hyperplasia, from hyper- + -plasia.

Online Etymology Dictionary, © 2010 Douglas Harper

hyperplasia in Medicine




An abnormal increase in cells in a tissue or organ, excluding tumor formation, whereby the bulk of the tissue or organ is increased.
Related formshy′per•plastic (-plăstĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.