From 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]
From 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]