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From Biology-Online Dictionary | Biology-Online Dictionary
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1. A small projection from any structure; internal spurs (septa) at the level of division of arteries and confluence of veins when branches or roots form an acute angle.

See: vascular spur.

2. A dull spine or projection from a bone.

3. Archaic term for a horny outgrowth from the skin.

Synonym: spur.

Origin: L. Spur, cock's spur