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the incrustation that forms over a sore or wound during healing.

Veterinary Pathology.��a mangy disease in animals, especially sheep; scabies.

Plant Pathology.��

1. a disease of plants characterized by crustlike lesions on the affected parts and caused by a fungus or bacterium.

2. one of these crustlike lesions.

a worker who refuses to join a labor union or to participate in a union strike, who takes a striking worker's place on the job, or the like.

Slang.��a rascal or scoundrel.

Metallurgy.��

1. a projection or roughness on an ingot or casting from a defective mold.

2. a surface defect on an iron or steel piece resulting from the rolling in of scale.

Carpentry.��a short, flat piece of wood used for various purposes, as binding two timbers butted together or strengthening a timber at a weak spot.

to become covered with a scab.

to act or work as a scab.