Pronunciation: (in'sēm"),[key] —n. an inside or inner seam of a garment, esp. the seam of a trouser leg that runs from the crotch down to the bottom of the leg.
—adj. 1. of or pertaining to such a seam: inseam measurements. 2. (of a pocket) placed at or sewn to an opening in the seam of a garment, usually the side seam, so as to lie completely inside the garment.