adjective 1.not identical on both sides of a central
line; unsymmetrical; lacking symmetry:
Most faces are asymmetric. 2.(of a logical or mathematical relation) holding true of members of a class in one order but not in the opposite order, as in the relation “being an ancestor of.”
3.Chemistry.a.having an unsymmetrical arrangement of atoms in a molecule.
b.noting a carbon atom bonded to four different atoms or groups.
c.(of a polymer) noting an atom or group that is within a polymer chain and is bonded to two different atoms or groups that are external to the chain.
Also, a·sym·met·ri·cal.
Origin: 1870–75; a-6 +
symmetric Related forms a·sym·met·ri·cal·ly, adverb