English

hyperreaction

From hyper- + reaction.

Proto-Indo-European *úp

Proto-Indo-European *upér ‘over, above’

Proto-Hellenic *hupér

Ancient Greek ὑπέρ ‘over’

Proto-Indo-European *h₂eǵ- ‘to drive’

…

Latin reagō ‘to act upon again; to react’

Latin reāctiō ‘reaction’

Old French reaction

Middle English reaccion

Today it means

noun excessive reaction

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

Etymograph / hyperreaction