Having the shape or form of a cirrus; resembling a curl, lock of hair, or tendril.
From Latin cirrus (a curl) and -form (having the shape of). The term describes anything shaped like a spiral curl or fine hair.
Cirrus clouds are named for their 'feathery' appearance, and at 20,000 feet up, they're made of ice crystals that form into those delicate curls because of wind shear—they're literally nature's feather dusters.
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