ad. 原文如此

Carborundum \Car`bo*run"dum\ (k[aum]r`b[-o]*r[u^]n"d[u^]m), [a
trade name, from Carbon + corundum.]
A beautiful crystalline compound, {silicon carbide} ({SiC}),
consisting of carbon and silicon in combination; -- also
called {carbon silicide}. It is made by heating carbon and
sand together in an electric furnace. The commercial article
is dark-colored and iridescent. It is harder than emery, and
is used as an abrasive.
[Webster 1913 Suppl.]

Sic \Sic\, a.
Such. [Scot.]


Sic \Sic\, adv. [L.]
Thus.

Note: This word is sometimes inserted in a quotation [sic],
to call attention to the fact that some remarkable or
inaccurate expression, misspelling, or the like, is
literally reproduced.