Abnormal \Ab*nor"mal\, a. [For earlier anormal.F. anormal, LL. anormalus for anomalus, Gr. ?. Confused with L. abnormis. See Anomalous, Abnormous, Anormal.]

Not conformed to rule or system; deviating from the type; anomalous; irregular. ``That deviating from the type; anomalous; irregular. '' --Froude.

Source: Webster's Revised Unabridged Dictionary (1913)