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From Biology-Online Dictionary | Biology-Online Dictionary
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1. (Science: zoology) same as alpaca.

2. [Peruv. Paco, pacu, red, reddish, reddish ore containing silver; perh. A different word.

(Science: chemical) An earthy-looking ore, consisting of brown oxide of iron with minute particles of native silver.

Origin: Sp. Paco, fr. Peruv. Paco. Cf. Alpaca.