Bow-compass
enUKBow´-com`pass
| n. | 1.An arcograph. | 2.A small pair of compasses, one leg of which carries a pencil, or a pen, for drawing circles. Its legs are often connected by a bow-shaped spring, instead of by a joint. | 3.A pair of compasses, with a bow or arched plate riveted to one of the legs, and passing through the other. |