Etymology
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subnormal (adj.)

1875, from sub- + normal. The noun is from 1710 in geometry; 1916, of persons.

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Definitions of subnormal
1
subnormal (n.)
a person of less than normal intelligence;
2
subnormal (adj.)
below normal or average;
after the floods the harvests were subnormal
subnormal intelligence
From wordnet.princeton.edu