Cirrus

sir′us, n. the highest form of clouds consisting of curling fibres: ( bot. ) a tendril: ( zool. ) any curled filament:— pl. Cirri (sir′ī). — adjs. Cirr′ate , Cirr′iform , like a cirrus; Cirr′igrade , moving by cirri.— n. Cirr′o-cū′mulus , a fleecy cloud intermediate between the cirrus and cumulus.— adj. Cirr′ose , with tendrils.— n. Cirr′o-strā′tus , a mottled-looking cloud intermediate between the cirrus and stratus.— adj. Cirr′ous , having a cirrus. [L.]