Definition that contains hard shell
- walnut nut of any of various walnut trees having a wrinkled two-lobed seed with a hard shell
- barnacle marine crustaceans with feathery food-catching appendages; free-swimming as larvae; as adults form a hard shell and live attached to submerged surfaces
- quahog Atlantic coast round clams with hard shells; large clams usually used for chowders or other clam dishes
- hard-shell clam Atlantic coast round clams with hard shells; large clams usually used for chowders or other clam dishes
- hard-shell crab edible crab that has not recently molted and so has a hard shell
- cirripede marine crustaceans with feathery food-catching appendages; free-swimming as larvae; as adults form a hard shell and live attached to submerged surfaces
- testaceous relating to or possessing a testa or hard shell
- quahaug Atlantic coast round clams with hard shells; large clams usually used for chowders or other clam dishes
- cirriped marine crustaceans with feathery food-catching appendages; free-swimming as larvae; as adults form a hard shell and live attached to submerged surfaces
- round clam Atlantic coast round clams with hard shells; large clams usually used for chowders or other clam dishes