Princeton's WordNet

1. scab, strikebreaker, blackleg, rat(noun)

   someone who works (or provides workers) during a strike

2. scab(verb)

   the crustlike surface of a healing skin lesion

3. scab(verb)

   form a scab

   "the wounds will eventually scab"

4. fink, scab, rat, blackleg(verb)

   take the place of work of someone on strike

Kernerman English Learner's Dictionary

1. scab(noun)æb

   dried blood covering a cut in the skin

Wiktionary

1. scab(Noun)

   An incrustation over a sore, wound, vesicle, or pustule, formed during healing.

2. scab(Noun)

   (colloquial or obsolete) The scabies.

3. scab(Noun)

   The mange, especially when it appears on sheep.

4. scab(Noun)

   Several different diseases of potatoes producing pits and other damage on their surface, caused by Streptomyces -bacteria.

5. scab(Noun)

   Short form for common scab, a relatively harmless variety of scab caused by Streptomyces scabies.

6. scab(Noun)

   Any one of various more or less destructive fungus diseases attacking cultivated plants, and forming dark-colored crustlike spots.

7. scab(Noun)

   (founding) 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 mean, dirty, paltry fellow.

9. scab(Noun)

   A worker who acts against trade union policies, especially a strikebreaker.

10. scab(Verb)

    To get covered by a scab.

11. scab(Verb)

    To act as strikebreaker.

12. scab(Verb)

    To beg (for), cadge, bum

    I scabbed some money off a friend.

Origin: sceabb, Old Norse skabb, Latin scabies Cognate with scafan, Latin scabere "to scratch"

Webster Dictionary

1. Scab(noun)

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

2. Scab(noun)

   the itch in man; also, the scurvy

3. Scab(noun)

   the mange, esp. when it appears on sheep

4. Scab(noun)

   a disease of potatoes producing pits in their surface, caused by a minute fungus (Tiburcinia Scabies)

5. Scab(noun)

   a slight irregular protuberance which defaces the surface of a casting, caused by the breaking away of a part of the mold

6. Scab(noun)

   a mean, dirty, paltry fellow

7. 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

8. Scab(verb)

   to become covered with a scab; as, the wound scabbed over

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