Webster's Revised Unabridged Dictionary · 1913

Inseam

Inseam , transitive verb

To impress or mark with a seam or cicatrix. — Pope

inseam (in"sēm) , noun

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.
2.
The length of the inseam of a trouser leg.