Acorn |
The fruit of the oak, being an oval nut growing in a woody cup or cupule. |
n. |
Acorn |
A cone-shaped piece of wood on the point of the spindle above the vane, on the mast-head. |
n. |
Acorn |
See Acorn-shell. |
n. |
Acorn cup |
The involucre or cup in which the acorn is fixed. |
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Argus shell |
A species of shell (Cypraea argus), beautifully variegated with spots resembling those in a peacock's tail. |
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Ark shell |
A marine bivalve shell belonging to the genus Arca and its allies. |
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Boat shell |
A marine gastropod of the genus Crepidula. The species are numerous. It is so named from its form and interior deck. |
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Boat shell |
A marine univalve shell of the genus Cymba. |
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Bubble shell |
A marine univalve shell of the genus Bulla and allied genera, belonging to the Tectibranchiata. |
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Mask shell |
Any spiral marine shell of the genus Persona, having a curiously twisted aperture. |
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Pouch-shell |
A small British and American pond snail (Bulinus hypnorum). |
n. |
Rice-shell |
Any one of numerous species of small white polished marine shells of the genus Olivella. |
n. |
Sea acorn |
An acorn barnacle (Balanus). |
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Shell |
A hard outside covering, as of a fruit or an animal. |
n. |
Shell |
The covering, or outside part, of a nut; as, a hazelnut shell. |
n. |
Shell |
A pod. |
n. |
Shell |
The hard covering of an egg. |
n. |
Shell |
The hard calcareous or chitinous external covering of mollusks, crustaceans, and some other invertebrates. In some mollusks, as the cuttlefishes, it is internal, or concealed by the mantle. Also, the hard covering of some vertebrates, as the armadillo, the tortoise, and the like. |
n. |
Shell |
Hence, by extension, any mollusks having such a covering. |
n. |
Shell |
A hollow projectile, of various shapes, adapted for a mortar or a cannon, and containing an explosive substance, ignited with a fuse or by percussion, by means of which the projectile is burst and its fragments scattered. See Bomb. |
n. |