1. plural of cirrus; thin, wispy clouds at high altitude
Usage: meteorology
2. plural of cirrus; slender, flexible appendages or tendrils in various organisms
Usage: biology

Examples

• The cirri stretched across the evening sky like delicate brushstrokes.
• High-altitude cirri often indicate changing weather patterns.
• The barnacle’s cirri swept through the water to capture food particles.
• Marine biologists studied the cirri of various sea creatures.
• Feathery cirri drifted overhead at 30,000 feet.
• The organism used its cirri to anchor itself to the rock surface.