8 letters · 13 points in Scrabble
adjective happening or recurring at regular intervals
adjective recurring or reappearing from time to time
originFrom French périodique, from Medieval Latin periodicus (“cyclical”), from Latin periodus (“complete sentence, period, circuit”), from Ancient Greek περίοδος (períodos, “cycle, period of time”). By surface analysis, period + -ic.
Etymology from Wiktionary, CC BY-SA 3.0