of or relating to former Eastern Christian or Orthodox churches that have been received under the jurisdiction of the Church of Rome but retain their own rituals and practices and canon law
In the former-uniate areas of western Ukraine things were more turbulent.
From the en.wikipedia.org
In his writings, Vyshenskyi opposed Catholicism and the uniate church.
From the en.wikipedia.org
More examples
Uniat: a member of the Uniat Church
Of or relating to former Eastern Christian or Orthodox churches that have been received under the jurisdiction of the Church of Rome but retain their own rituals and practices and canon law
A branch of the Roman Catholic Church that preserves the Eastern Rite (Orthodox) liturgy and discipline but recognizes papal authority.