Definition of: scab

(skab) noun
1. A crust formed on the surface of a wound or sore.
2. A contagious disease among sheep, resembling mange; scabies.
3. Any of certain plant diseases of bacterial or fungous origin, in which there is a roughened or warty exterior.
4. Slang A mean, paltry fellow.
5. A workman who does not belong to or will not join or act with a labor union; one who takes the place of a striker; a strikebreaker.
—v.i. scabbed, scab·bing
1. To form or become covered with a scab.
2. To take the place of a striker; act as a scab. [Fusion of ON skabbr (assumed) and OE sceabb; infl. in meaning by L scabies. See SCABIES.]
—scabbed adjective
—scab′bi·ly adverb
—scab′bi·ness noun
—scab′by adjective