triskaideka-

The story

1. Ancient Greek · learned borrowing fromτρεισκαίδεκα“thirteen”
2. English todaytriskaideka-

Learned borrowing from Ancient Greek τρεισκαίδεκα (treiskaídeka, “thirteen”), from τρεῖς (treîs, “three”) + καί (kaí, “and”) + δέκα (déka, “ten”). By surface analysis, tris- + -kai- + deka-.