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diurnal arc
(astrology) the path followed by a planet, point, or degree from its rising point to its setting point.
minute of arc
An angle, one sixtieth of a degree.
second of arc
An angle, one sixtieth (1/60th) of a minute of arc or one 3600th of a degree.
arc lamp
An electric arc arranged so as to produce useful light.
arc up
(Australia, slang) To become upset or angry.
（ present singular third-person ）
（ participle present ）
（ participle past ）
（ past ）
nocturnal arc
(astronomy) The arc of a circle described by the Sun, or a star, in the night.
circumhorizontal arc
An optical phenomenon, a large, brightly spectrum-coloured band running parallel to the horizon, formed by the refraction of sunlight or moonlight in plate-shaped ice crystals suspended in the atmosphere, typically in cirrus or cirrostratus clouds.
arc lamps
arc-boutant
(architecture) Synonym of flying buttress
electric arc
A discharge of electricity across a gap that causes ionization of the air (or other gas) resulting in a bright, hot plasma
