Where does “рад” come from?

рад (Russian) comes from Russian радиан, from Latin radius, from English -án, from Middle English -an.

рад (Russian): glad; rad; API •  m inan

Definitions

  1. glad; rad; API •  m inan

Ancestry of “рад”, step by step

рад traces back through two separate lines of ancestry.

via Russian радиан

StepLanguageWordMeaning
1Russianрадиан
2Latinradiusray; staff, rod; spoke
3English-ánOf or pertaining to;. Often added to words of Latin origin, but also used with words of other origins. When a word ends in a
4Middle English-an

via Proto-Slavic radъ

StepLanguageWordMeaning
1Proto-Slavicradъglad; dear; willing
2Proto-Slavic-iťьDenominal, forming masculine attributables from...

Words derived from “рад

Every word from Middle English -anEvery word from English -ánEvery word from Latin radius
рад — Etymology, Origin & Word History | Etymology Explorer