subnormal

Etymology

sub- + normal

adj

1. Less than normal.
   His intelligence was considered subnormal, but as a musician he was a genius.
2. (computing theory) denormal
   Subnormal numbers cannot be normalized because this would result in an exponent that does not fit into the exponent field. 2007, Ward Cheney, David Kincaid, Numerical mathematics and computing, page 704

noun

1. A person whose abilities are less than normal.
   the IQ scores of mental subnormals
2. (geometry) That part of the axis of a curved line which is intercepted between the ordinate and the normal.