"cirrus" in the noun sense

1. cirrus, cirrhus

usually coiled

2. cirrus, cirrus cloud

a wispy white cloud (usually of fine ice crystals) at a high altitude (4 to 8 miles)

3. cirrus

a slender flexible animal appendage as on barnacles or crinoids or many insects often tactile

Source: WordNet® (An amazing lexical database of English)

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