SUBNORMAL
subnormal
(adjective) below normal or average; “after the floods the harvests were subnormal”; “subnormal intelligence”
subnormal
(noun) a person of less than normal intelligence
Source: WordNet® 3.1
Etymology
Adjective
subnormal (comparative more subnormal, superlative most subnormal)
Less than normal.
(computing theory) denormal
Noun
subnormal (plural subnormals)
A person whose abilities are less than normal.
(geometry) That part of the axis of a curved line which is intercepted between the ordinate and the normal.
Source: Wiktionary
Sub*nor"mal, n. (Geom.)
Definition: That part of the axis of a curved line which is intercepted
between the ordinate and the normal.
Source: Webster’s Unabridged Dictionary 1913 Edition