10 letters · 19 points in Scrabble
noun a convoluted tubule in each testis; carries sperm to vas deferens
originFrom Ancient Greek ἐπιδιδυμίς (epididumís), from ἐπί (epí, “upon, over”) + δίδυμος (dídumos, “twin; testicle”).
Etymology from Wiktionary, CC BY-SA 3.0