a visible mass of particles of water or ice at a usu great height in the air
a light puffy or billowy mass, e.g. of smoke or dust, in the air
a mass of opaque matter in interstellar space
a great crowd or multitude; a swarm, esp of insects
clouds of mosquitoes
something that obscures or blemishes or causes a feeling of gloom
on cloud nine
informal feeling extremely elated or happy
[from meteorology, in which cloud types are numbered. Cloud nine denotes cumulonimbus, which has an elaborate structure suggestive of fantasy.]under a cloud
under suspicion or in a bad mood
with one's head in the clouds
out of touch with reality
cloudless adj
cloudlessly adv
cloudlet /ʹklowdlit/ noun
[Old English clūd]