Where does “illustrissimo” come from?

illustrissimo (Italian) comes from Italian illustre, from Latin illūstris, from Latin illustro, from Latin lūstrō, from Latin lūstrum, from Old Latin loustrom, from Proto-Indo-European lewkstrom, from Proto-Indo-European lewk- — bright; to shine; to see.

Ancestry of “illustrissimo”, step by step

StepLanguageWordMeaning
1Italianillustreillustrious, renowned, famous, distinguished;...
2Latinillūstrisbright, shining, brilliant, lustrous
3LatinillustroI illuminate, brighten, light up; I elucidate,...
4Latinlūstrōto purify by means of a propitiatory sacrifice
5Latinlūstrumbog, morass, place where boars and swine wallow
6Old Latinloustrom
7Proto-Indo-Europeanlewkstrom
8Proto-Indo-Europeanlewk-bright; to shine; to see
Every word from Proto-Indo-European lewk-Every word from Proto-Indo-European lewkstromEvery word from Old Latin loustrom