cirrous (adj.)

1650s in biology, "having or resembling a tendril;" 1815 in meteorology, from Latin cirrus "lock of hair, tendril" (see cirrus) + -ous. Also sometimes cirrose.

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nimbostratus (n.)

"thick, low, dark cloud from which rain or snow falls," 1932 (earlier use from late 19c. refers to different cloud types), from Modern Latin nimbus "cloud" (see nimbus) + connecting element -o- + stratus (see stratus). Nimbus as "a rain cloud" is attested from 1803. 

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cloudlet (n.)

"a small cloud," 1788, from cloud (n.) + diminutive suffix -let.

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Proto-Indo-European root meaning "cloud."

It forms all or part of: nebula; nebular; nebulosity; nebulous; Neptune; Nibelungenlied; Niflheim; nimbus.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit nabhas- "vapor, cloud, mists, fog, sky;" Greek nephele, nephos "cloud;" Latin nebula "mist, vapor, fog, smoke, exhalation;" German Nebel "fog;" Old English nifol "dark, gloomy;" Welsh niwl "cloud, fog;" Slavic nebo.

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unclouded (adj.)

1590s, from un- (1) "not" + past participle of cloud (v.).

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Indonesian name for New Guinea, said to mean literally "cloud-covered."

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cloudless (adj.)

"without clouds, unobscured," 1590s, from cloud (n.) + -less. Related: Cloudlessly; cloudlessness.

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silver lining (n.)

a "bright side" which proverbially accompanies even the darkest trouble; by 1843, apparently from oft-quoted lines from Milton's "Comus," where the silver lining is the light of the moon shining from behind the cloud.

Was I deceived? or did a sable cloud
Turn forth her silver lining on the night?
I did not err, there does a sable cloud,
Turn out her silver lining on the night
And casts a gleam over this tufted grove.

Thomas Warton added the commentary: "When all succour ſeems to be lost, Heaven unexpectedly presents the ſilver lining oſ a ſable cloud to the virtuous."

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