The Collaborative International Dictionary of English v.0.48:

Corset \Cor"set\ (k?r"s?t), n. [F., dim. of OF. cors, F. corps,
   body. See Corse.]
   1. In the Middle Ages, a gown or basque of which the body was
      close fitting, worn by both men and women.
      [1913 Webster]

   2. An article of dress inclosing the chest and waist worn
      (chiefly by women) to support the body or to modify its
      shape; stays.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Corset \Cor"set\ (k?r"s?t), v. t. [imp. & p. p. Corseted; p.
   pr. & vb. n. Corseting.]
   To inclose in corsets.
   [1913 Webster]

WordNet (r) 3.0 (2006):

corset
    n 1: a woman's close-fitting foundation garment [syn: corset,
         girdle, stays]
    v 1: dress with a corset

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "corset":
   advocate, alpenstock, arm, athletic supporter, back, backbone,
   backing, bandeau, bearer, bra, brace, bracer, bracket, brassiere,
   buttress, cane, carrier, cervix, corselet, crook, crutch,
   foundation garment, fulcrum, girdle, guy, guywire, jock, jockstrap,
   mainstay, maintainer, mast, neck, prop, reinforce, reinforcement,
   reinforcer, rest, resting place, rigging, shoulder, shroud, spine,
   sprit, staff, standing rigging, stave, stay, stays, stick,
   stiffener, strengthener, support, supporter, sustainer, upholder,
   walking stick