English

lightfast

From light + fast.

A compound of light + fast

Proto-Indo-European *lewk- ‘to shine’

…

Proto-Germanic *leuhtą

Proto-West Germanic *leuht ‘light’

Old English lēoht

Middle English light ‘light, illumination’

English light

Proto-Germanic *fastuz ‘fixed’

Proto-West Germanic *fast ‘fixed’

Old English fæst ‘firm’

Middle English fast

English fast

Today it means

adj Resistant to fading.

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

Etymograph / lightfast