1. A United States unit of capacity or volume equal to 1.804 cubic inches
   "The bartender poured a fl. oz. of liquor into the cocktail";
   - fluidounce, fluid ounce
    
2. A British imperial unit of capacity or volume (liquid or dry) equal to 8 fluid drams or 28.416 cubic centimetres (1.734 cubic inches)
   "The recipe called for 2 fl. oz. of vanilla extract";
   - fluidounce, fluid ounce

Type of: British capacity unit, Imperial capacity unit, United States liquid unit

Part of: gill