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