Illustration of cloud
- 1 cirrus
- 2 cirrostratus
- 3 cirrocumulus
- 4 altostratus
- 5 altocumulus
- 6 stratocumulus
- 7 nimbostratus
- 8 cumulus
- 9 cumulonimbus
- 10 stratus
1
: a visible mass of particles of condensed vapor (such as water or ice) suspended in the atmosphere of a planet (such as the earth) or moon
2
: something resembling or suggesting a cloud: such as
a
: a light filmy, puffy, or billowy mass seeming to float in the air
a cloud of blond hair
a ship under a cloud of sail
b(1)
: a usually visible mass of minute particles suspended in the air or a gas
(2)
: an aggregation of usually obscuring matter especially in interstellar space
(3)
: an aggregate of charged particles (such as electrons)
c
: a great crowd or multitude : swarm
clouds of mosquitoes
3
: something that has a dark, lowering, or threatening aspect
clouds of war
a cloud of suspicion
4
: something that obscures or blemishes
a cloud of ambiguity
5
: a dark or opaque vein or spot (as in marble or a precious stone)
6
: the computers and connections that support cloud computing
storing files in the cloud
—often used before another nouncloud storage/backup
cloud software
clouded; clouding; clouds
1
: to grow cloudy
—usually used with over or up
clouded over before the storm
2
a
of facial features
: to become troubled, apprehensive, or distressed in appearance
her face clouded with worry
b
: to become blurry, dubious, or ominous
—often used with over
the outlook is clouding over
3
: to billow up in the form of a cloud
1
a
: to envelop or hide with or as if with a cloud
b
: to make opaque especially by condensation of moisture
steam clouded the windows
c
: to make murky especially with smoke or mist
smoke clouded the sky
2
: to make unclear or confused
cloud the issue
4
: to cast gloom over
cloud prospects for success
Cite this Entry
“Cloud.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cloud. Accessed 4 Sep. 2026.
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