con'tact

[L. contact us, a touching.] ± The touching or apposition of two bodies, -j. The closing of an electrical circuit. 3. A person who has been exposed to contagion, c. break'er, interrupter, a device for rapidly opening and closing an electrical circuit, c. point, the part of the contact surface of a tooth which touches the adjacent tooth. c. sur'face, facies contact us [BNA], the surface of a tooth which looks toward its neighbor, either mesially or distally; proximal surface, prox'- imal c, prox'imate c, touching of the adjacent surfaces of two teeth.