cloud classification[′klau̇d ‚klas·ə·fə′kā·shən]
A scheme of distinguishing and grouping clouds according to their appearance and, where possible, to their process of formation.
A scheme of classifying clouds according to their altitudes: high, middle, or low clouds.
A scheme of classifying clouds according to their particulate composition: water clouds, ice-crystal clouds, or mixed clouds.
Nimbus is a suffix often given to the rain-bearing clouds.