in·seam \ˈinˌsēm\noun Etymology:in- (II) + seam : an inner seam: as a.: the seam from the crotch to the leg bottom of trousers b.: a seam showing on the inside only used for articles (as gloves) often made without outside seams c.: a hidden seam in a welt shoe fastening the welt, lining, and shoe upper to the insole