arc

An arc is a curve. You can describe the bend of a rainbow as an arc.

In math, an arc is one section of a circle, but in life you can use the word to mean any curved shape, like the arc of a ballerina's arm or the graceful arc of a flowering vine over a trellis. In the 14th century, arc first meant the movement of the sun in the sky, from the Old French arc, "bow or arch," and the Latin root arcus, also "bow or arch."

Primary Meanings of arc

1.
nv
a continuous portion of a circle
form an arch or curve
2.
n
electrical conduction through a gas in an applied electric field
Full Definitions of arc
1

n a continuous portion of a circle

Types:
limb
the graduated arc that is attached to an instrument for measuring angles
Type of:
curve, curved shape
the trace of a point whose direction of motion changes

n something curved in shape

Synonyms:
bow
Types:
rainbow
an arc of colored light in the sky caused by refraction of the sun's rays by rain
Type of:
curve, curved shape
the trace of a point whose direction of motion changes

v form an arch or curve

Synonyms:
arch, curve
Types:
camber
curve upward in the middle
Type of:
bend, flex
form a curve
2

n electrical conduction through a gas in an applied electric field

Synonyms:
discharge, electric arc, electric discharge, spark
Types:
brush discharge
discharge between electrodes creating visible streamers of ionized particles
Saint Elmo's fire, Saint Elmo's light, Saint Ulmo's fire, Saint Ulmo's light, St. Elmo's fire, corona, corona discharge, corposant, electric glow
an electrical discharge accompanied by ionization of surrounding atmosphere
flashover
an unintended electric discharge (as over or around an insulator)
Type of:
electrical conduction
the passage of electricity through a conductor

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