scab

Pronunciation: /skæb/

The English word “scab” has 14 meanings listed here.

noun

An incrustation over a sore, wound, vesicle, or pustule, formed during healing.
The scabies.
The mange, especially when it appears on sheep.
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).
Common scab, a relatively harmless variety of scab (potato disease) caused by Streptomyces scabies.
Any one of various more or less destructive fungal diseases that attack cultivated plants, forming dark-colored crustlike spots.
A slight irregular protuberance which defaces the surface of a casting, caused by the breaking away of a part of the mold.
A mean, dirty, paltry fellow.
A worker who acts against trade union policies; any picket crosser (strikebreaker), and especially one with devotion to union busting.

verb

To become covered by a scab or scabs.
To form into scabs and be shed, as damaged or diseased skin.
To remove part of a surface (from).
To act as a strikebreaker.
To beg (for), to cadge or bum.

Etymology

From Middle English scabb, scabbe (also as shabbe, schabbe > English shab), from Old English sċeabb and Old Norse skabb, both from Proto-Germanic *skabbaz (“scab, scabies”), from Proto-Indo-European *skabʰ- (“to cut, split, carve, shape”). Doublet of shab. Cognate with German Schabe (“scabies”), Danish skab (“scab, scabies”), Swedish skabb (“scab, scabies”), Latin scabies (“scab, itch, mange”).…

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.