Pronunciation: (sub-nôr'mul), [key]
1. below the normal; less than or inferior to the normal: a subnormal amount of rain.
2. being less than average in any psychological trait, as intelligence, personality, or emotional adjustment.
1. a subnormal person.
2. Geom.that part of the x-axis of a curve cut off between the ordinate and a normal.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.