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
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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]

aplastic (eɪˈplæstɪk)
1.  relating to or characterized by aplasia
2.  failing to develop into new tissue; defective in the regeneration of tissue, as of blood cells: aplastic anaemia

Collins English Dictionary - Complete & Unabridged 10th Edition
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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.

aplastic a·plas·tic (ā-plās'tĭk, ə-plās'-)

  1. Unable to form or regenerate tissue.

  2. Of, relating to, or characterized by aplasia.

The American Heritage® Stedman's Medical Dictionary
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Example sentences for aplastic
Aplastic anemia is caused by the inability of the bone marrow to produce blood cells.
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