11 letters · 18 points in Scrabble
originFrom Latin troglodyticus, Ancient Greek τρωγλοδυτικός (trōglodutikós, “of cave-/hole-dwellers”) from τρωγλοδύτης (trōglodútēs, “cave-/hole-dweller”) from τρώγλη (trṓglē, “hole”) + δύω (dúō, “enter, go into”), equivalent to troglodyte + -ic.
Etymology from Wiktionary, CC BY-SA 3.0