1. An incrustation
over a sore, wound, vesicle, or pustule, formed
by the drying up of the discharge
from the diseased
2. The itch
in man; also, the scurvy.
3. The mange, especially. When it appears on sheep.
4. A malady
of potatoes producing pits in their surface, caused by a minute fungus
5. A slight iregular protuberance which defaces the surface of a casting, caused by the breaking away
of a part
of the mold.
6. A mean, dirty, paltry fellow.
7. A nickname for a workman who
engages for lower wages than are fixed
by the trades unions; also, for one who
takes the seat
of a workman on a strike.
Origin: OE. Scab, scabbe, shabbe; cf. AS. Scaeb, sceabb, scebb, Dan. & Sw. Skab, and also
L. Scabies, tr. Scabere to scratch, akin
to E. Shave. See Shave, and cf. Shab, Shabby.
Source: Websters Vocabulary