English

lightmap

From light + map.

A compound of light + map

Proto-Indo-European *lewk- ‘to shine’

…

Proto-Germanic *leuhtą

Proto-West Germanic *leuht ‘light’

Old English lēoht

Middle English light ‘light, illumination’

English light

Medieval Latin mappa mundī

Old French mapamonde ‘world map’

Middle English mappemounde ‘world map’

English map

Today it means

noun A precomputed data structure that stores the brightnesses of surfaces in a video game, etc.

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

Etymograph / lightmap