A man who belongs to one of the religious brotherhoods of the Roman Catholic Church A friar strives to be free of worldly goods so that he may engage in preaching, missionary work, or other charitable undertakings
A friar is a member of one of several Catholic religious orders. a member of a religious group of Catholic men, who travelled around in the past teaching about Christianity and who were very poor monk (frere , from frater)
a fat and cheerful monk (=a member of an all-male religious group) , who enjoys eating and drinking, and appears in old English stories about Robin Hood as one of his followers. Friar Tuck