• Coagulation, a clot of bodily fluids
• Strikebreaker, person who works despite strike action or takes against will of employees

Animal and plant diseases

• Apple scab, a fungal infection of the apple
• Fusarium head blight, a fungal disease of grain crops
• Scab disease in sheep, caused by attack by the sheep scab mite Psoroptes ovis
• Black scab, a fungal infection of the potato

Immunology

• scAb, a single-chain antibody fragment

See also

• Scabies, a skin disease caused by the mite Sarcoptes scabiei