11 letters · 20 points in Scrabble
noun any worm of the Chaetognatha; transparent marine worm with horizontal lateral and caudal fins and a row of movable curved spines at each side of the mouth
originFrom Ancient Greek χαίτη (khaítē, “flowing hair”) + γνάθος (gnáthos, “jaw”). By surface analysis, chaeto- + -gnath (compare -gnathous).
Etymology from Wiktionary, CC BY-SA 3.0