"a nun, a religious woman," 1690s, from French religieuse, fem. of religieux "monk, religious person" (itself used in English from 1650s but much less common), noun use of the adjective meaning "religious" (see religious). As a type of pastry, attested from 1929.
"pertaining to or characteristic of a religious recluse," mid-15c., monastik, from Old French monastique "monkish, monastic" and directly from Medieval Latin monasticus, from Ecclesiastical Greek monastikos "solitary, pertaining to a monk," from Greek monazein "to live alone" (see monastery). Related: Monastical (c. 1400).
"Islamic monk or friar who has taken a vow of poverty and austerity," 1580s, from Turkish dervish, from Persian darvesh, darvish "beggar, poor," hence "religious mendicant;" equivalent of Arabic faqir (see fakir). The "whirling dervishes" are one order among many. Originally dervis; modern spelling is from mid-19c.
"member of one of the mendicant monastic orders of the Church," late 13c., frere, from Old French frere "brother, friar" (9c., Modern French frère), originally referring to the mendicant orders (Franciscans, Augustines, Dominicans, Carmelites), who reached England early 13c., from Latin frater "brother" (from PIE root *bhrater- "brother"). Also in general use, "brother, friend, comrade" (c. 1300).
By the word [friar] is meant a member of one of the mendicant orders, i.e. those living entirely on alms, especially the 'four orders' of Franciscans, Dominicans, Carmelites, & Augustinian Hermits. [Monk] is used sometimes of all male members of religious orders including friars, but properly excludes the mendicants. In the latter case the general distinction is that while the monk belongs essentially to his particular monastery, & his object is to make a good man of himself, the friar's sphere of work is outside, & his object is to do a good work among the people. [Fowler]
"pilgrim; itinerant monk going from shrine to shrine under a perpetual vow of poverty;" originally "pilgrim who has returned from the Holy Land," c. 1300, palmere (mid-12c. as a surname), from Anglo-French palmer (Old French palmier), from Medieval Latin palmarius, from Latin palma "palm tree" (see palm (n.2)). So called because they wore palm branches in commemoration of the journey. "The distinction between pilgrim and palmer seems never to have been closely observed" [Century Dictionary].