an incrustation over a sore, wound, vesicle, or pustule, formed by the drying up of the discharge from the diseased part.-the itch in man; also, the scurvy.-the mange, esp. when it appears on sheep.-a disease of potatoes producing pits in their surface, caused by a minute fungus (tiburcinia scabies).-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 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.-to become covered with a scab; as, the wound scabbed over.