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adjective
1.
covered with or affected by scabs.
2.
Obsolete. mean or petty.
noun
1.
the incrustation that forms over a sore or wound during healing.
2.
Veterinary Pathology. a mangy disease in animals, especially sheep; scabies.
Compare itch (def 10).
3.
Plant Pathology.

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

4.
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.
5.
Slang. a rascal or scoundrel.
6.
Metallurgy.

a projection or roughness on an ingot or casting from a defective mold.
a surface defect on an iron or steel piece resulting from the rolling in of scale.

7.
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.
verb (used without object), scabbed, scabbing.
8.
to become covered with a scab.
9.
to act or work as a scab.
noun
1.
the dried crusty surface of a healing skin wound or sore
2.
a contagious disease of sheep, a form of mange, caused by a mite (Psoroptes communis)
3.
a fungal disease of plants characterized by crusty spots on the fruits, leaves, etc
4.
(derogatory)

Also called blackleg. a person who refuses to support a trade union’s actions, esp one who replaces a worker who is on strike
(as modifier): scab labour

5.
a despicable person
verb (intransitive) scabs, scabbing, scabbed
6.
to become covered with a scab
7.
(of a road surface) to become loose so that potholes develop
8.
to replace a striking worker

scab (skāb)
n.

A crust formed from and covering a healing wound.

Scabies or mange in domestic animals or livestock, especially sheep.

v. scabbed, scab·bing, scabs
To become covered with scabs or a scab.
scab
(skāb)
A crust that forms over a healing wound, consisting of dried blood, plasma, and other secretions.

scab definition

Informally, a worker who stays on the job while others go on strike. Also, a worker brought in to keep a plant operating when its work force is on strike. (See strikebreaker.)
scab