- a very large, edible, saltwater clam of the genus Panope that burrows into the mud, feeding through a long siphon, the so-called neck, that extends upward: specimens of P. generosa(Pacific geoduck ), of the waters off western Canada and northwestern United States, have been found to live more than 140 years, and some have exceeded a shell length of 10 inches (25 centimeters), a siphon length of 5 feet (1.5 meters), and a weight of 15 pounds (7 kilograms).
- a large edible clam
