ark
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.
Origin
[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