• (a.) Not plastic or easily molded.
<pathology> Lacking in cell production, as in aplastic anaemia. ... Origin: Gr. Plassein = to form ... (27 Sep 1997) ... 
A·plas'tic adjective [ Prefix a- not + plastic .] Not plastic or easily molded. 
Type: Term Pronunciation: ā-plas′tik, ă- Definitions: 1. Pertaining to aplasia, or conditions characterized by defective regeneration, as in aplastic anemia.
aplastic Without the power to grow toward normal, healthy tissue.