vena
/ˈbena/ · B1 · noun · f
vein
🩸 vena = vein + a: straight from Latin vena, feminine like most -a nouns
English vein comes from the same Latin word vena, so just add -a. Spanish says the v like a soft b, so it sounds like BEH-na. It is feminine: la vena. The same root gives intravenous, which means into the vein.