a. [ L. heteroclitus, Gr. &unr_;; &unr_; other + &unr_; to lean, incline, inflect: cf. F. hétéroclite. ] Deviating from ordinary forms or rules; irregular; anomalous; abnormal. [ 1913 Webster ]

n. 1. (Gram.) A word which is irregular or anomalous either in declension or conjugation, or which deviates from ordinary forms of inflection in words of a like kind; especially, a noun which is irregular in declension. [ 1913 Webster ]

2. Any thing or person deviating from the common rule, or from common forms. Howell.