| chiton | (noun) primitive elongated bilaterally symmetrical marine mollusk having a mantle covered with eight calcareous plates | Synonyms: coat-of-mail shell, polyplacophore, sea cradle |
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| (noun) a woolen tunic worn by men and women in ancient Greece | - |
| graviton | (noun) a gauge boson that mediates the (extremely weak) gravitational interactions between particles | - |
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| piton | (noun) a metal spike with a hole for a rope; mountaineers drive it into ice or rock to use as a hold | - |
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| soliton | (noun) (physics) a quantum of energy or quasiparticle that can be propagated as a traveling wave in nonlinear systems and is neither preceded nor followed by another such disturbance; does not obey the superposition principle and does not dissipate | Synonyms: solitary wave, soliton wave |
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| triton | (noun) small usually bright-colored semiaquatic salamanders of North America and Europe and northern Asia | Synonyms: newt |
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| (noun) tropical marine gastropods having beautifully colored spiral shells | - |