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 (species).
Any one of various more or less destructive fungaldiseases that attack cultivated plants, forming dark-colored crustlike spots.
A slight irregularprotuberance which defaces the surface of a casting, caused by the breaking away of a part of the mold.
From Middle English scabb, scabbe (also as shabbe, schabbe > English shab), from Old English sċeabb and Old Norse skabb, both from Proto-Germanic *skabbaz, from Proto-Indo-European *skabʰ-. Cognate with German Schabe, Danish skab, Swedish skabb, Latin scabies. Related also to Old English scafan, Latin scabere, English shabby.
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