Term: ark shell: marine bivalve mollusk having a heavy toothed shell with a deep boat-like inner surface
Broader: animal: a living organism characterized by voluntary movement | Unrelated: pewee: small olive-colored woodland flycatchers of eastern North America
Broader: animal: a living organism characterized by voluntary movement | Unrelated: poplar: soft light-colored non-durable wood of the poplar
Broader: animal: a living organism characterized by voluntary movement | Unrelated: superstrate: any stratum or layer superimposed on another
Broader: animal: a living organism characterized by voluntary movement | Unrelated: track: a bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll
Broader: animal: a living organism characterized by voluntary movement | Unrelated: lemmus: lemmings
Broader: animal: a living organism characterized by voluntary movement | Unrelated: electrical power: the product of voltage and current
Broader: animal: a living organism characterized by voluntary movement | Unrelated: quintessence: the purest and most concentrated essence of something
Broader: animal: a living organism characterized by voluntary movement | Unrelated: tailspin: rapid descent of an aircraft in a steep spiral
Broader: animal: a living organism characterized by voluntary movement | Unrelated: fellow traveler: a communist sympathizer (but not a member of the Communist Party)
Broader: animal: a living organism characterized by voluntary movement | Unrelated: pick: a heavy iron tool with a wooden handle and a curved head that is pointed on both ends