1. a person or thing that weighs one ounce or is measured in ounces
Usage: informal; often used in sports or commerce contexts
2. a boxer or fighter in a weight class near one ounce (used informally or humorously)
Usage: informal; rare

Examples

• The jeweler carefully weighed each ouncer of gold.
• In boxing, an ouncer might refer to a very light fighter.
• The recipe calls for a few ouncers of chocolate chips.
• The scale displayed the weight in ouncers for precision measurement.