Where does “radiantness” come from?

radiantness (English) comes from English radiant, from Middle French radiant, from Latin radiantis, from Latin radiare, from Latin radius, from English -án, from Middle English -an.

radiantness (English): radiance

Definitions

  1. radiance

Ancestry of “radiantness”, step by step

radiantness traces back through two separate lines of ancestry.

via English radiant

StepLanguageWordMeaning
1EnglishradiantRadiating light and/or heat; Emitted as...
2Middle Frenchradiant
3Latinradiantisgenitive masculine singular of radiāns; genitive...
4Latinradiarepresent active infinitive of radiō; second-person...
5Latinradiusray; staff, rod; spoke
6English-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
7Middle English-an

via English Ness

StepLanguageWordMeaning
1EnglishNessAn Ulster princess and the mother of Conchobar mac Nessa and Findchoem in the Ulster Cycle of Irish mythology. Daughter of Eochaid Sálbuide. Also the mother of Cormac Cond Longas by incest with Conchobar mac Nessa
2Middle Englishnesse
3Old Englishnæsnot, not at all; not; first/third-person singular...
4Proto-Germanicnasjąfoothill; headland; cape
5Proto-Indo-Europeannéh₂snose
Every word from Middle English -an