Definitions from Wiktionary ( )

▸ noun:  An incrustation over a sore, wound, vesicle, or pustule, formed during healing.
▸ noun:  (colloquial or obsolete) The scabies.
▸ noun:  The mange, especially when it appears on sheep.
▸ noun:  (uncountable) Any of several different diseases of potatoes producing pits and other damage on their surface, caused by streptomyces bacteria (but formerly believed to be caused by a fungus).
▸ noun:  Common scab, a relatively harmless variety of scab (potato disease) caused by Streptomyces scabies.
▸ noun:  (phytopathology) Any one of various more or less destructive fungal diseases that attack cultivated plants, forming dark-colored crustlike spots.
▸ noun:  (founding) A slight irregular protuberance which defaces the surface of a casting, caused by the breaking away of a part of the mold.
▸ noun:  A mean, dirty, paltry fellow.
▸ noun:  (derogatory, slang) A worker who acts against trade union policies; any picket crosser (strikebreaker), and especially one with devotion to union busting.
▸ verb:  (intransitive) To become covered by a scab or scabs.
▸ verb:  (intransitive) To form into scabs and be shed, as damaged or diseased skin.
▸ verb:  (transitive) To remove part of a surface (from).
▸ verb:  (intransitive) To act as a strikebreaker.
▸ verb:  (transitive, UK, Australia, New Zealand, informal) To beg (for), to cadge or bum.

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