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From The Collaborative International Dictionary of English v.0.48:
nun \nun\ (n[u^]n), n. [OE. nunne, AS. nunne, fr. L. nonna nun, nonnus monk; cf. Gr. ?, ?; of unknown origin. Cf. Nunnery.] [1913 Webster] 1. A woman devoted to a religious life, who lives in a convent, under the three vows of poverty, chastity, and obedience. [1913 Webster] They holy time is quiet as a nun Breathless with adoration. --Wordsworth. [1913 Webster] 2. (Zool.) (a) A white variety of domestic pigeons having a veil of feathers covering the head. (b) The smew. (c) The European blue titmouse. [1913 Webster] Gray nuns (R. C. Ch.), the members of a religious order established in Montreal in 1745, whence branches were introduced into the United States in 1853; -- so called from the color or their robe, and known in religion as Sisters of Charity of Montreal. Nun buoy. See under Buoy. [1913 Webster]