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countable and uncountable, plural pacos or pacoes
(archaic) An alpaca.
An earthy-looking ore, consisting of brown oxide of iron with minute particles of native silver. quotations examples
Mr. Ratcliffe has sometimes found them to contain arsenic in an oxidized state, combined with ferric oxide, and once he met with a paco ore mainly composed of antimony ochre.
1880, John Percy, Metallurgy: the art of extracting metals from their ores, page 652