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A knife with a regular shaped blade.

Knife Colter

A knife with a regular shaped blade.

A knife whose blade is round.

Rolling Colter

A knife whose blade is round.

"A knife with only one edge, which formed a straight line. The blade was pointed, and its back curved. It was used for a variety of purposes, but chiefly for killing animals either in the slaughter house, or in hunting, or at the altars of the gods. The priest who conducted a sacrifice never killed the victim himself; but one of his ministri, appointed for that purpose who was called either by the general name minister, or the more specific popa or cltrarius. The annexed woodcut represents the tombstone of a cultrarius, with two cultri upon it." — Smith, 1873

Culter

"A knife with only one edge, which formed a straight line. The blade was pointed, and its back curved.…