Where does “radii” come from?

radii (Esperanto) comes from Esperanto radio, from Latin radius, from English -án, from Middle English -an.

radii (Esperanto): to radiate

Definitions

  1. to radiate

Ancestry of “radii”, step by step

StepLanguageWordMeaning
1Esperantoradioradio
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—

Words derived from “radii”

Every word from Middle English -an →Every word from English -án →Every word from Latin radius →