asym;met;ri;cal pronunciation: variant(s): or asym;met;ric function: adjective etymology: greek asymmetria lack of proportion, from asymmetros ill-proportioned, from a- + symmetros symmetricaldate: 1690 1 : not symmetrical2 usually asymmetric of a carbon atom : bonded to four different atoms or groups— asym;met;ri;cal;ly adverb — asym;me;try noun