tetrakaideka-

The story

1. Ancient Greek · learned borrowing fromτεσσᾰρεσκαίδεκᾰ“fourteen”
2. English todaytetrakaideka-

Learned borrowing from Ancient Greek τεσσᾰρεσκαίδεκᾰ (tessăreskaídekă, “fourteen”), from τέσσᾰρες (téssăres, “four”) + καί (kaí, “and”) + δέκᾰ (dékă, “ten”). By surface analysis, tetra- + -kai- + deka-.