The Collaborative International Dictionary of English v.0.48:

Nursery \Nurs"er*y\, n.; pl. Nurseries. [Cf. F. nourricerie.]
   1. The act of nursing. [Obs.] "Her kind nursery." --Shak.
      [1913 Webster]

   2. The place where nursing is carried on; as:
      (a) The place, or apartment, in a house, appropriated to
          the care of children.
      (b) A place where young of any species, plant or animal,
          are nourished preparatory to transfer elsewhere;
          especially a place where young trees, shrubs, vines,
          etc., are propagated for the purpose of transplanting;
          a plantation of young trees.
      (c) The place where anything is fostered and growth
          promoted. "Fair Padua, nursery of arts." --Shak.
          [1913 Webster +PJC]

                Christian families are the nurseries of the
                church on earth, as she is the nursery of the
                church in heaven.                 --J. M. Mason.
          [1913 Webster]
      (d) That which forms and educates; as, commerce is the
          nursery of seamen.
          [1913 Webster]

   3. That which is nursed. [R.] --Milton.
      [1913 Webster]

WordNet (r) 3.0 (2006):

nursery
    n 1: a child's room for a baby [syn: nursery, baby's room]
    2: a building with glass walls and roof; for the cultivation and
       exhibition of plants under controlled conditions [syn:
       greenhouse, nursery, glasshouse]

Moby Thesaurus II by Grady Ward, 1.0:

63 Moby Thesaurus words for "nursery":
   X ray, bedchamber, bedroom, birthplace, blood bank, boudoir,
   breeding place, brooder, chamber, charity ward, clinic, cloche,
   cold frame, conservatory, consultation room, coolhouse, cradle,
   cubicle, cubiculum, day nursery, delivery room, dispensary,
   dormitory, emergency, examining room, fever ward, forcing bed,
   forcing house, forcing pit, glasshouse, greenhouse, hatchery,
   hospital room, hotbed, hothouse, incubator, infant school,
   intensive care, isolation, kindergarten, labor room, laboratory,
   lathhouse, maternity ward, nest, nidus, operating room, orangery,
   pharmacy, pinery, preschool, prison ward, private room,
   recovery room, rookery, seedbed, semi-private room, sleeping room,
   summerhouse, surgery, therapy, treatment room, ward