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1. A wispy white cloud (usually of fine ice crystals) at a high altitude (4 to 8 miles)
   - cirrus cloud
    
2. A thin tendril, usually coiled
   - cirrhus
    
3. A slender flexible animal appendage as on barnacles, crinoids or many insects; often tactile

Sounds like: cerous, serous

Derived forms: cirri

Type of: appendage, cloud, outgrowth, process, tendril

Encyclopedia: Cirrus