a high cloud of ice crystals grouped into small separate globular masses, usually occurring above 6000 metres (20 000 feet)
See also mackerel sky
cirrocumulus in American English
(ˌsɪroʊˈkjumjələs)
noun
the type of white cloud that resembles a small puff, flake, or streak, found at high altitudes and consisting of ice crystals and water droplets; mackerel sky