Definition of underwrap:
(n) :
An undergarment that consists of a cloth wrapped around the body.
(v) :
To provide with a wrapping that will subsequently be covered or wrapped by something else.
(v) :
To provide with an underwrap.
(n) :
(medicine) A lightweight foam that is applied to the skin to reduce irritation before wrapping with supportive tape.
(n) :
(medicine) A sheath that surrounds a limb and which is used under a cast.
(n) :
(sewing) The portion of a garment that is overlapped by another portion, such as the hidden part of a wrap skirt or the edge that holds buttons which is hidden when a garment is buttoned up.