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

1880–85; a-6 + -plasia

aplastic [ey-plas-tik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aplasia (əˈpleɪzɪə)
pathol congenital absence or abnormal development of an organ or part
[C19: New Latin, from a-1 + -plasia, from Greek plassein to form]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1885, medical L., from Gk. a-, privative prefix, + plasis "formation," from plassein "to form" (see plasma).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

aplasia a·pla·si·a (ə-plā'zē-ə, -zhə)

  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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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