Where does “emergency light” come from?

emergency light (English) comes from English light, from Middle English liht, from Middle English light, from Old English lēoht, from Proto-West Germanic leuht, from Proto-Germanic leuhtą, from Proto-Indo-European lewktom, from Proto-Indo-European lewk- — bright; to shine; to see.

emergency light (English): An electric light that turns on to give light...

Definitions

  1. An electric light that turns on to give light...

Ancestry of “emergency light”, step by step

emergency light traces back through two separate lines of ancestry.

via English light

StepLanguageWordMeaning
1EnglishlightVisible electromagnetic radiation. The human eye...
2Middle EnglishlihtAlternative form of light
3Middle EnglishlightThe radiation which allows for vision by...
4Old Englishlēohtluminous, bright, light, clear, resplendent,...
5Proto-West Germanicleuhtlight, bright; light
6Proto-Germanicleuhtąlight
7Proto-Indo-Europeanlewktom
8Proto-Indo-Europeanlewk-bright; to shine; to see

via English emergency

StepLanguageWordMeaning
1EnglishemergencyA situation which poses an immediate risk and...
2Latinemergensemerging
3LatinemergoI emerge; I surface; I arise or come forth
4Latinmergōto dip (in), immerse; plunge into water; drown
5Proto-Indo-European*mésgetito sink
6Proto-Indo-Europeanmesg-to dip, sink
Every word from Proto-Indo-European lewk-Every word from Proto-Indo-European lewktomEvery word from Proto-Germanic leuhtą