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.