1. A curved line or segment of a circle.

2. Continuous luminous passage of an electric current in a gas or vacuum between two or more separated carbon or other electrodes.


[L. arcus, a bow]

auricular arc

bregmatolambdoid arc

crater arc

flame arc

interauricular arc

longitudinal arc of skull

mercury arc

nasobregmatic arc

naso-occipital arc

pulmonary arc

reflex arc

Riolan’s arc