Heteroclite
Heteroclite , adjective
[Latin heteroclitus, Greek {not transcribed}; {not transcribed} other + {not transcribed} to lean, incline, inflect: compare French hétéroclite.]
Deviating from ordinary forms or rules; irregular; anomalous; abnormal.
Heteroclite , noun
1.
(Grammar) 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.
2.
Any thing or person deviating from the common rule, or from common forms. — Howell