Where does “spinosissimo” come from?

spinosissimo (Italian) comes from Italian spinoso, from Latin spinosus, from Latin spīna, from Proto-Italic speinā, from Proto-Indo-European spēy- — to stretch; thrive; succeed.

Ancestry of “spinosissimo”, step by step

StepLanguageWordMeaning
1Italianspinosoprickly, thorny, spiny; thorny, ticklish, touchy;...
2Latinspinosusthorny, prickly
3Latinspīnaa thorn or a thorny tree or shrub, such as whitethorn, hawthorn, or blackthorn
4Proto-Italicspeināthorn
5Proto-Indo-Europeanspēy-to stretch; thrive; succeed
Every word from Proto-Indo-European spēy- →Every word from Proto-Italic speinā →Every word from Latin spīna →