1. a North American diving duck with a blue-gray bill, especially the lesser or greater scaup

Examples

• The hunter spotted a flock of bluebills on the lake.
• Bluebills are common waterfowl in the Great Lakes region.
• The bluebill dove underwater to search for food.
• During migration, thousands of bluebills gather in coastal waters.
• The male bluebill has distinctive white markings on its back.
• Birdwatchers often confuse bluebills with other diving ducks.