English
emergency light
From emergency + light.
A compound of emergency + light
Proto-Indo-European *mesg- ‘to dip’
…
Latin mergō ‘to dip’
Latin emergo ‘to emerge’
Latin emergens ‘emerging’
Medieval Latin emergentia
English emergency
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
noun An electric light that turns on to give light during a power outage.
Language periods are conventional ranges, not dates for this word.
Etymograph / emergency light