Where does “light-sensitive” come from?

light-sensitive (English) comes from English sensitive, from Middle French sensitif, from Medieval Latin sensitivus, from Latin sentio, from Proto-Italic sentjō, from Proto-Indo-European sent-, from Proto-Indo-European h₁es- — to be.

light-sensitive (English): affected by, or sensitive to light; changing...

Definitions

  1. affected by, or sensitive to light; changing...

Ancestry of “light-sensitive”, step by step

light-sensitive traces back through two separate lines of ancestry.

via English sensitive

StepLanguageWordMeaning
1EnglishsensitiveHaving the faculty of sensation; pertaining to...
2Middle Frenchsensitif
3Medieval Latinsensitivussensitive; detectable, perceivable
4LatinsentioI feel, I sense, I perceive; I perceive, I am...
5Proto-Italicsentjō
6Proto-Indo-Europeansent-to head for, to go, to travel; to feel
7Proto-Indo-Europeanh₁es-to be

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 h₁es-Every word from Proto-Indo-European sent-Every word from Proto-Italic sentjō