a prefix occurring in certain obsolete words (ywis) and especially in archaic past participles: yclad.
Why Are A, E, I, O, U, And Y Called “Vowels”?In elementary school, we all learned the vowels of the English language: A, E, I, O, U, and sometimes Y. But, what makes a vowel a vowel?
Origin of y-
Middle English y-, i- (reduced variant a-), Old English ge-, prefix with perfective, intensifying, or collective force; cognate with Old Frisian, Old Saxon ge-, gi-, Gothic ga-, German ge-; compare perhaps Latin com- com-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019