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1. (Science: chemical) a siliceous variety of calcite, or carbonate of lime, having a silvery-white, pearly luster, and a waving or curved lamellar structure.

2. White metal coated with silver.

3. (Science: zoology) a fish of Europe (Maurolicus Pennantii) with silvery scales. The name is also applied to various fishes of the genus Argentina.

4. A citizen of the argentine republic.

Origin: cf. F. Argentin, fr. L. Argentum silver.