SCAB

noun a mean, dirty, paltry fellow.

2. scab ·noun the itch in man; also, the scurvy.

3. scab ·noun the mange, ·esp. when it appears on sheep.

4. scab ·vi to become covered with a scab; as, the wound scabbed over.

5. scab ·noun a disease of potatoes producing pits in their surface, caused by a minute fungus (tiburcinia scabies).

6. scab ·noun an incrustation over a sore, wound, vesicle, or pustule, formed by the drying up of the discharge from the diseased part.

7. scab ·noun a slight irregular protuberance which defaces the surface of a casting, caused by the breaking away of a part of the mold.

8. scab ·noun a nickname for a workman who engages for lower wages than are fixed by the trades unions; also, for one who takes the place of a workman on a strike.

9. scab ·add. ·noun any one of various more or less destructive fungus diseases attacking cultivated plants, and usually forming dark-colored crustlike spots.