English

sub-light

From sub- + light.

A compound of sub- + light

Proto-Indo-European *upó ‘up; from below’

Proto-Italic *supo ‘under’

Latin sub ‘under, beneath, below’

English sub-

Proto-Indo-European *lewk- ‘to shine’

…

Proto-Germanic *leuhtą

Proto-West Germanic *leuht ‘light’

Old English lēoht

Middle English light ‘light, illumination’

English light

Today it means

adj At less than the speed of light.

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

Etymograph / sub-light