The Collaborative International Dictionary of English v.0.48:

Inseam \In*seam"\, v. t. [imp. & p. p. Inseamed; p. pr. & vb.
   n. Inseaming.]
   To impress or mark with a seam or cicatrix. --Pope.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

inseam \in"seam\ ([i^]n"s[=e]m), n.
   1. An inside seam of an article of clothing; especially, the
      seam that runs from the crotch of a trouser leg down to
      the bottom.
      [PJC]

   2. The length of the inseam of a trouser leg.
      [PJC]