Definitions

1. noun

A variant of a molecule or an ion that has the same composition but different physical or chemical properties, often distinguished by differences in the arrangement of atoms.

“The presence of an allomorph in the chemical reaction altered its outcome.”

2. noun

A variant of a linguistic unit, especially a phoneme or a morpheme, that has the same function or meaning but a different form.

“The linguist studied the different allomorphs of the verb ‘to be’ in various languages.”