Irregular or anomalous in form or structure, especially in grammar or biology.
From Greek heteroclitos (irregular), combining hetero- (different) + klitos (inflected). Originally a linguistic term for verbs that don't follow normal conjugation patterns.
English irregular verbs like 'go-went-gone' are heteroclital—they break all the normal rules, which is why children learning to speak say 'goed' before they master the actual irregular form!
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