Meaning of Y- in English

a prefix occurring in certain obsolete words ( ywis ) and esp. in archaic past participles: yclad. Also, i- .

[ ME y-, i- (reduced var. a- ), OE ge-, prefix with perfective, intensifying, or collective force; c. OFris, OS ge-, gi-, Goth ga-, G ge-; cf. perh. L com- COM- ]

Random House Webster's Unabridged English dictionary.      Полный английский словарь Вебстер - Random House .