1. the larva of a caddisfly, typically living in water and building a protective case from small stones, twigs, or other debris
Usage: entomology
2. a type of artificial fishing fly made to imitate a caddisfly or its larva
Usage: fishing

Examples

• The caddis built its case from tiny pebbles and sand grains.
• We found several caddis larvae in the stream bed.
• The trout were feeding on emerging caddis flies.
• He tied a brown caddis to match the insects on the water.
• Caddis cases can be found attached to rocks in clean streams.
• The angler switched to a caddis pattern when the hatch began.