"cirri" 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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