English

lightpath

From light + path.

A compound of light + path

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 *paþaz ‘path’

Proto-West Germanic *paþ ‘path’

Old English pæþ ‘path’

Middle English path

English path

Today it means

noun A section of an optical network in which light travels without being modified.

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

Etymograph / lightpath