defective development or congenital absence of a limb, organ, or other body part.
relating to or characterized by aplasia
failing to develop into new tissue; defective in the regeneration of tissue, as of blood cells: aplastic anaemia
(pathol) congenital absence or abnormal development of an organ or part

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

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

Unable to form or regenerate tissue.

Of, relating to, or characterized by aplasia.

aplasia a·pla·si·a (ə-plā’zē-ə, -zhə)

Congenital absence of an organ or tissue.

Incomplete, retarded, or defective development of an organ or tissue.

Cessation of the usual regenerative process in an organ or tissue.

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