plural of arc lamp

(architecture) Synonym of flying buttress

A rare halo, formed by internal reflection through ice crystals, that curves upwards from the horizon and touches the tricker arc above the anthelic point.

An extended or continuing storyline in episodic storytelling media such as television or comic books.

A weak aurora above the tropics

plural of arc-boutant

(of a topological space) Such that every pair of points in the space comprises the boundary of some arc embedded in the space.

(metallurgy) The process of welding two pieces of metal together using the heat generated by an electric arc between two electrodes.

plural of second of arc

A discharge of electricity across a gap that causes ionization of the air (or other gas) resulting in a bright, hot plasma