English

hypoadditive

From hypo- + additive.

Proto-Indo-European *upó ‘under, below’

Ancient Greek ὑπό ‘under’

English hypo-

Proto-Indo-European *deh₃- ‘to give’

Latin addō ‘to add’

Late Latin additivus

Today it means

adj Less than additive (possibly even subtractive)

Language periods are conventional ranges, not dates for this word.

Etymograph / hypoadditive