circumhorizontal arc (English, noun)
expansion: circumhorizontal arc (plural circumhorizontal arcs)
Senses:
glosses: 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.
Forms:
form: circumhorizontal arcs
tags: plural