A deformity is a part of the body that has an unusual or irregular shape, different from what's typical. Someone might be born with a deformity, like a hand with extra fingers or a twisted foot, or develop one later through injury or illness. A broken bone that heals incorrectly can cause a deformity in an arm or leg.

The word describes the physical difference itself, not the person who has it. Doctors use this term clinically when diagnosing conditions or planning treatments. A surgeon might correct a spinal deformity to help someone stand straighter, or an orthopedist might treat a foot deformity to make walking easier.

Throughout history, people with visible deformities have faced cruel treatment and prejudice. Even today, some people stare or make assumptions about someone's abilities based on appearance alone. Many individuals with physical deformities live full, accomplished lives and have made important contributions in all fields.