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Noun: cirrus (cirri)  seer-us [N. Amer], si-rus [Brit]
  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