• synonyms


noun Pathology.
  1. defective development or congenital absence of a limb, organ, or other body part.
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Origin of aplasia

First recorded in 1880–85; a-6 + -plasia
Related formsa·plas·tic [ey-plas-tik] /eɪˈplæs tɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for aplasia


  1. pathol congenital absence or abnormal development of an organ or part
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Word Origin

C19: New Latin, from a- 1 + -plasia, from Greek plassein to form
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 aplasia


1885, medical Latin, from Greek a-, privative prefix (see a- (3)), + -plasia.

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Online Etymology Dictionary, © 2010 Douglas Harper

aplasia in Medicine


  1. Congenital absence of an organ or tissue.
  2. Incomplete, retarded, or defective development of an organ or tissue.
  3. Cessation of the usual regenerative process in an organ or tissue.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.