not identical on both sides of a central line
; unsymmetrical; lacking symmetry: Most faces are asymmetric.
(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.
noting a carbon atom bonded to four different atoms or groups.
(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.
Origin: 1870–75; a-6 Related forms