(n.) One of the four principal forms of clouds. See Cloud.

Cloudcuckooland alto-cumulus alto-stratus anvil cloud banner cloud billowy cloud cap cloud cirro-cumulus cirro-fillum cirro-nebula cirro-stratus cirro-velum cirrus cirrus cloud cirrus haze cirrus stripe cloud cloud band cloud bank cloud drift cloud mass cloud street cloudland cloudling cloudscape cocktail cottony cloud cumulo-cirro-stratus cumulo-cirrus cumulo-nimbus cumulo-stratus cumulus cloud curl cloud fleecy cloud fractocumulus high fog mackerel sky mammatocumulus mushroom cloud nimbus nimbus cloud rain cloud scud snail cloud squall cloud storm cloud strato-cumulus stratus stratus cloud thundercloud thunderhead water carrier woolpack