prefix
Etymology: Middle English y-, i-, from Old English ge-, perfective, associative, and collective prefix (often used to form perfective verbs whose past participles were subsequently made to function as the past participles of the corresponding simple verbs) — more at co-
— used in few especially archaic past participles that have survived or have been revived from an earlier period of the language and occasionally in other verb forms coined by analogy with such past participles
y pointing