1. Plural of louis; gold coins formerly used in France, especially the louis d'or.
Usage: historical; often capitalized
2. Plural of louie; informal term for a lieutenant, especially in the military.
Usage: informal; military slang

Examples

• The collector displayed a rare set of louies from the 18th century.
• The museum's numismatic exhibit featured several valuable louies.
• The louies in the platoon gathered for their briefing.
• He was promoted to one of the louies in his unit.
• The antique dealer specialized in trading old louies and other European currency.