Does Subnormal Mean Abnormal?

below the normal; less than or inferior to the normal: a subnormal amount of rain. being less than average in any psychological trait, as intelligence, personality, or emotional adjustment.

What is subnormal abnormality?

As adjectives the difference between abnormal and subnormal

is that abnormal is not conforming to rule or system; deviating from the usual or normal type while subnormal is less than normal.

What do you mean by subnormal?

1 : lower or smaller than normal. 2 : having less of something and especially of intelligence than is normal.