sprag 
(sprăg)
(sprăg)n.
1.
a. A piece of wood or metal wedged beneath a wheel or between spokes to keep a vehicle from rolling.
b. A pointed stake lowered at an angle into the ground from a vehicle to prevent movement.
2. A prop to support a mine roof.
[Perhaps of Scandinavian origin.]
- Communard
- commune
- commune
- communer
- communicability
- communicable
- communicableness
- communicably
- communicant
- communicate
- communication
- communicational
- communication disorder
- communication engineering
- communicative
- communicatively
- communicativeness
- surround sound
- surtax
- surtitle
- Suruga Bay
- surveil
- surveillance
- surveillant
- survey