1. a small fiber or thread-like structure
Usage: biology; anatomy
2. a fine threadlike component of muscle tissue or other biological material
Usage: medical; technical

Examples

• The muscle tissue contained thousands of tiny fibrils.
• Collagen fibrils give strength to connective tissue.
• Under the microscope, we could see individual fibrils in the sample.
• The protein formed long fibrils when it crystallized.
• Cardiac muscle fibrils contract rhythmically to pump blood.
• The researcher studied how fibrils assemble into larger structures.