Undress \Un*dress"\, v. t. [1st pref. un- + dress.]

1. To divest of clothes; to strip.

2. To divest of ornaments to disrobe.

3. (Med.) To take the dressing, or covering, from; as, to undress a wound.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Undress \Un"dress\, n.

1. A loose, negligent dress; ordinary dress, as distinguished from full dress.

2. (Mil. & Naval) An authorized habitual dress of officers and soldiers, but not full-dress uniform.

Undress parade (Mil.), a substitute for dress parade, allowed in bad weather, the companies forming without arms, and the ceremony being shortened.

Source: Webster's Revised Unabridged Dictionary (1913)