Where does “safelight” come from?

safelight (English) comes from English safe, from Middle English sauf, from Old French sauf, from Latin salvus, from Proto-Italic *salawos, from Proto-Indo-European solh₂wós, from Proto-Indo-European sōlh₂- — mercy, comfort; comfort, mercy.

safelight (English): The lamp in a photographic darkroom

Definitions

  1. The lamp in a photographic darkroom

Ancestry of “safelight”, step by step

safelight traces back through two separate lines of ancestry.

via English safe

StepLanguageWordMeaning
1EnglishsafeNot in danger; out of harm's reach; Free from...
2Middle EnglishsaufNot having experienced harm, damage, or ill...
3Old Frenchsauf
4Latinsalvussafe, saved, preserved, sound, unharmed,...
5Proto-Italic*salawoswhole
6Proto-Indo-Europeansolh₂wós
7Proto-Indo-Europeansōlh₂-mercy, comfort; comfort, mercy

via English Light

StepLanguageWordMeaning
1EnglishLightA place name
2Middle EnglishlightThe radiation which allows for vision by...
3Old Englishlēohtluminous, bright, light, clear, resplendent,...
4Proto-West Germanicleuhtlight, bright; light
5Proto-Germanicleuhtąlight
6Proto-Indo-Europeanlewktom
7Proto-Indo-Europeanlewk-bright; to shine; to see
Every word from Proto-Indo-European sōlh₂-Every word from Proto-Indo-European solh₂wósEvery word from Proto-Italic *salawos