Where does “refractivity” come from?

refractivity (English) comes from English refractive, from English refract, from Latin refractum, from Latin refractus, from Latin refringere, from Latin rĕ-, from Latin prōdūcō, from Latin prō- — passed , crossed.

refractivity (English): The quality or degree of being refractive

Definitions

  1. The quality or degree of being refractive

Ancestry of “refractivity”, step by step

refractivity traces back through two separate lines of ancestry.

via English refractive

StepLanguageWordMeaning
1EnglishrefractiveThat refracts; causing or relating to refraction
2EnglishrefractTo change direction as a result of entering a...
3Latinrefractumnominative neuter singular of refrāctus;...
4Latinrefractusbroken up or open
5Latinrefringeresecond-person singular future passive indicative...
6Latinrĕ-back, backwards
7Latinprōdūcōto lead or bring forth, forward or out
8Latinprō-forward direction, forward movement
9Proto-Italic*pro-pro- see the Latin entry for further meanings
10Proto-Indo-Europeanpro-toward, forward
11Proto-Indo-Europeanpor-to give birth; forward, through; going, passage
12Proto-Indo-Europeanper-before, in front; first; to go through
13Proto-Indo-Europeanpr̥tóspassed , crossed

via English ity

StepLanguageWordMeaning
1Englishity
2Ingrian-uUsed to form nouns from verbs
Every word from Proto-Indo-European pr̥tós