1. Plural of caseworm; larvae of certain insects (such as caddisflies) that construct and live in protective cases or tubes made of silk, sand, plant material, or other substances.
Usage: Commonly used in entomology and freshwater ecology; Often observed in streams and ponds

Examples

• The stream was full of caseworms clinging to rocks beneath the water.
• Caseworms use their silk to bind together bits of sand and gravel into protective tubes.
• Fishermen often use caseworms as bait because trout find them attractive.
• The biology class observed caseworms under the microscope to study insect metamorphosis.
• Different species of caseworms construct cases from different materials depending on their environment.