Webster's Revised Unabridged Dictionary · 1913

Selvage

Selvage , noun

[Self + edge, that is, its own proper edge; compare OD. selfegge.]

1.
The edge of cloth which is woven in such a manner as to prevent raveling.
2.
The edge plate of a lock, through which the bolt passes. — Knight
3.
(Mining) A layer of clay or decomposed rock along the wall of a vein. See Gouge, n., 4. — Raymond

Also: Selvedge