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From Biology-Online Dictionary | Biology-Online Dictionary
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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.

3. (Science: chemical) a layer of clay or decomposed rock along the wall of a vein. See gouge.

Origin: Self _ edge, i. E, its own proper edge; cf. OD. Selfegge.