A Bolster

1. A large cushion or pillow.
2. A pad, quilt, or anything used to hinder pressure, support part of the body, or make a bandage sit easy upon a wounded part; a compress.
3. (vehicles, agriculture) A small spacer located on top of the axle of horse-drawn wagons that gives the front wheels enough clearance to turn.
4. A short, horizontal structural timber between a post and a beam for enlarging the bearing area of the post and/or reducing the span of the beam.

Synonyms: cross-head, pillow

5. A beam in the middle of a railway truck, supporting the body of the car.
6. The perforated plate in a punching machine on which anything rests when being punched.
7. The part of a knife blade that abuts upon the end of the handle.
8. The metallic end of a pocketknife handle.
9. (architecture) The rolls forming the ends or sides of the Ionic capital.
10. (military, historical) A block of wood on the carriage of a siege gun, upon which the breech of the gun rests when arranged for transportation.