terrification

Etymology tree
Proto-Indo-European *tres-
Proto-Indo-European *-yeti
Proto-Indo-European *-éyeti
Proto-Indo-European *troséyeti
Proto-Italic *trozeō
Latin terreō
Proto-Indo-European *-os
Proto-Indo-European *-s
Proto-Indo-European *-ōs
Proto-Italic *-ōs
Latin -or
Latin terrorbor.
Old French terreur
Middle French terreurbor.
Middle English terrour
English terror
English -ification
▲
Latin terreō
Proto-Indo-European *dʰeh₁-der.
Proto-Italic *θakos
Proto-Italic *-fakos
Latin -ficus
Latin terrificusder.
French terrifiqueder.
English terrific
Proto-Indo-European *-tis
Proto-Indo-European *-Hō
Proto-Indo-European *-tiHō
Proto-Italic *-tiō
Latin -tiō
Latin -ātiōlbor.
Old French -ationbor.
Middle English -acioun
English -ation
English terrification
From terror + -ification or alternatively terrific + -ation.