8 letters · 11 points in Scrabble
noun either of the two main stops on a pipe organ
originBorrowed from Latin diapason, from Ancient Greek διαπασῶν (diapasôn), that is διά (diá, “through”) + πασῶν (pasôn, “all”) (χορδῶν (khordôn, “notes”)), “through all (notes)”.
Etymology from Wiktionary, CC BY-SA 3.0