APLASIA Meaning of APLASIA in English [ ə'pleɪzɪə ]■ noun Medicine the failure of an organ or tissue to develop or to function normally.Derivativesaplastic adjective OriginC19: from a- 1 + Gk plasis 'formation'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004