noun Pathology.

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


  1. relating to or characterized by aplasia
  2. failing to develop into new tissue; defective in the regeneration of tissue, as of blood cellsaplastic anaemia


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

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


  1. Unable to form or regenerate tissue.
  2. Of, relating to, or characterized by aplasia.


  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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