What is "sisters of charity of montreal"

nun \nun\ (n[u^]n), n. [OE. nunne, AS. nunne, fr. L. nonna nun, nonnus monk; cf. Gr. ?, ?; of unknown origin. Cf. Nunnery.]

1. A woman devoted to a religious life, who lives in a convent, under the three vows of poverty, chastity, and obedience.

   They holy time is quiet as a nun Breathless with adoration.
   --Wordsworth.

2. (Zo["o]l.)

   1. A white variety of domestic pigeons having a veil of feathers covering the head.

   2. The smew.

   3. The European blue titmouse.

      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.