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Webster 1913 Edition

Noun.

ing.

pl.

[L.

scobs

, or

scobis

, fr.

scabere

to scrape.]

Raspings of ivory, hartshorn, metals, or other hard substance.

Chambers.

The dross of metals.

Noun.

[L. from scabo, to scrape.] Raspings of ivory, hartshorn or other hard substance; dross of metals, &c.

scobs pl ‎(plural only)

raspings of ivory, hartshorn, metals, or other hard substance
(Can we find and add a quotation of Chambers to this entry?)
The dross of metals.