| musquash | (noun) beaver-like aquatic rodent of North America with dark glossy brown fur | Synonyms: muskrat, Ondatra zibethica |
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| quasar | (noun) a starlike object that may send out radio waves and other forms of energy; many have large red shifts | Synonyms: quasi-stellar radio source |
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| quasiparticle | (noun) a quantum of energy (in a crystal lattice or other system) that has position and momentum and can in some respects be regarded as a particle | - |
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| quassia | (noun) handsome South American shrub or small tree having bright scarlet flowers and yielding a valuable fine-grained yellowish wood; yields the bitter drug quassia from its wood and bark | Synonyms: bitterwood, Quassia amara |
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| (noun) a bitter compound used as an insecticide and tonic and vermifuge; extracted from the wood and bark of trees of the genera Quassia and Picrasma | - |
| squash | (noun) a game played in an enclosed court by two or four players who strike the ball with long-handled rackets | Synonyms: squash rackets, squash racquets |
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| (noun) edible fruit of a squash plant; eaten as a vegetable | - |
| (noun) any of numerous annual trailing plants of the genus Cucurbita grown for their fleshy edible fruits | Synonyms: squash vine |