Arc

n.	1.	(Geom.) A portion of a curved line; as, the arc of a circle or of an ellipse.
	2.	A curvature in the shape of a circular arc or an arch; as, the colored arc (the rainbow); the arc of Hadley's quadrant.
	3.	An arch. Statues and trophies, and triumphal arcs. - Milton.
	4.	The apparent arc described, above or below the horizon, by the sun or other celestial body. The diurnal arc is described during the daytime, the nocturnal arc during the night. Electric arc See under Voltaic.
v. i.	1.	(Elec.) To form a voltaic arc, as an electrical current in a broken or disconnected circuit. [imp. & p. p. Arcked (ärkt); p. pr. & vb. n. Arcking.]

Noun	1.	arc - electrical conduction through a gas in an applied electric field Synonyms: electric arc, electric discharge, spark, discharge
	2.	arc - a continuous portion of a circle
	3.	arc - something curved in shape Synonyms: bow
Verb	1.	arc - form an arch or curve; "her back arches"; "her hips curve nicely" Synonyms: arch, curve

1.		ARC - Advanced RISC Computing Specification
2.	(file format, tool)	arc - An old archive format for IBM PC. The format is now so obscure that it is only likely to be supported by jack-of-all-trades decompression programs such as WINZIP.
3.	(mathematics, data)	arc - An edge in a tree. "branch" is a generally more common synonym.

Advanced RISC Computing [architecture] (ACE, RISC)AC arc, Poulsen arc, aperiodic discharge, arc column, arc discharge, arc light, arch, bend, bow, brush discharge, catacaustic, catenary, caustic, circle, color filter, conchoid, crook, curl, curvation, curvature, curve, diacaustic, dimmer, discharge, disruptive discharge, electric discharge, electric shock, electric spark, electrodeless discharge, ellipse, festoon, floats, flood, floodlight, footlights, foots, galvanic shock, gelatin, glow discharge, hook, hyperbola, klieg light, light plot, lights, limelight, lituus, marquee, medium, oscillatory discharge, parabola, round, shock, silent discharge, sinus, spark, spark gap, spot, spotlight, tracery