A member of the religious order of the Dominicans.
friar
noun
A member of a mendicant Christian order such as the Augustinians, Carmelites (white friars), Franciscans (grey friars) or the Dominicans (black friars).
An American fish, the silverside.
How often have the words black friar and friar occurred in a corpus of books? (source: Google Ngram Viewer )