cirrus

• 名词，指由细小冰晶组成、呈纤细丝缕状的高空云层（卷云）；在生物学中也指某些动物身上细长柔韧的附属器官。

A noun referring to a type of high-altitude cloud composed of fine ice crystals, appearing as thin, wispy strands; also used in biology for a slender, flexible appendage found on certain animals.

1. High-altitude cloudB2formalscientific

   A type of cloud composed of ice crystals, forming thin, wispy strands at high altitudes, typically between 4 and 8 miles.

   卷云

   • The sky was dotted with delicate cirrus clouds.
   • Cirrus clouds often indicate a change in the weather.
   • The pilot reported cirrus formations at 30,000 feet.

2. Tendril or appendageC1formalscientific

   A slender, flexible, and often coiled appendage found on certain animals, such as barnacles, crinoids, or insects, used for sensing or feeding.

   触须或附属物

   • The barnacle extended its cirrus to filter food from the water.
   • Crinoids use their feathery cirri to capture plankton.
   • The insect's cirrus was highly sensitive to touch.