from
The Collaborative International Dictionary of English v.0.48
Loreto nuns \Lo*ret"o nuns\, or Loretto nuns \Lo*ret"to nuns\
[From Loreto, a city in Italy famous for its Holy House, said
to be that in which Jesus lived, brought by angels from
Nazareth.] (R. C. Ch.)
Members of a congregation of nuns founded by Mrs. Mary Teresa
Ball, near Dublin, Ireland, in 1822, and now spread over
Ireland, India, Canada, and the United States. The nuns are
called also {Ladies of Loreto}. They are engaged in teaching
girls.
[Webster 1913 Suppl.]