Collar

1. A ring or round flange upon, surrounding, or against an object, and used for restraining motion within given limits, or for holding something to its place, or for hiding an opening around an object; as, a collar on a shaft, used to prevent endwise motion of the shaft; a collar surrounding a stovepipe at the place where it enters a wall. The flanges of a piston and the gland of a stuffing box are sometimes called collars.
2. A curb, or a horizontal timbering, around the mouth of a shaft.
3. A collar beam.
4. A colored ring round the neck of a bird or mammal.
5. A ring or cincture.
6. An ornament worn round the neck by knights, having on it devices to designate their rank or order.
7. To seize by the collar.
8. A ringlike part of a mollusk in connection with esophagus.
9. To put a collar on.
10. An eye formed in the bight or bend of a shroud or stay to go over the masthead; also, a rope to which certain parts of rigging, as dead-eyes, are secured.
11. The neck or line of junction between the root of a plant and its stem.
12. Something worn round the neck, whether for use, ornament, restraint, or identification; as, the collar of a coat; a lady's collar; the collar of a dog.