1. a room in which you can change clothes
The Collaborative International Dictionary of English v.0.48:
Dressing \Dress"ing\, n.
1. Dress; raiment; especially, ornamental habiliment or
attire. --B. Jonson.
2. (Surg.) An application (a remedy, bandage, etc.) to cover
a sore or wound. --Wiseman.
3. Manure or compost over land. When it remains on the
surface, it is called a top-dressing.
(a) A preparation, such as a sauce, to flavor food for
eating; a condiment; as, a dressing for salad.
(b) The stuffing of fowls, pigs, etc.; forcemeat.
5. Gum, starch, and the like, used in stiffening or finishing
silk, linen, and other fabrics.
6. An ornamental finish, as a molding around doors, windows,
or on a ceiling, etc.
7. Castigation; scolding; -- often with down. [Colloq.]
Dressing case, a case of toilet utensils.
Dressing forceps, a variety of forceps, shaped like a pair
of scissors, used in dressing wounds.
Dressing gown, a light gown, such as is used by a person
while dressing; a study gown.
Dressing room, an apartment appropriated for making one's
Top-dressing, manure or compost spread over land and not
worked into the soil.
Moby Thesaurus II by Grady Ward, 1.0:
39 Moby Thesaurus words for "dressing room":
L, R, acting area, apron, apron stage, backstage, band shell,
bandstand, board, bridge, cloakroom, closet, clothes closet,
coulisse, dock, fitting room, flies, fly floor, fly gallery,
forestage, greenroom, grid, gridiron, lightboard, linen closet,
orchestra, orchestra pit, performing area, pit, proscenium,
proscenium stage, shell, stage, stage left, stage right,
switchboard, the boards, wardrobe, wings