| rot | (noun) unacceptable behavior (especially ludicrously false statements) | Synonyms: buncombe, bunk, bunkum, guff, hogwash |
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| (noun) (biology) the process of decay caused by bacterial or fungal action | Synonyms: breakdown, decomposition, putrefaction, rotting |
| (noun) a state of decay usually accompanied by an offensive odor | Synonyms: putrefaction |
| rota | (noun) a roster of names showing the order in which people should perform certain duties | - |
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| rotary | (noun) a road junction at which traffic streams circularly around a central island | Synonyms: circle, roundabout, traffic circle |
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| (noun) electrical converter consisting of a synchronous machine that converts alternating to direct current or vice versa | Synonyms: rotary converter, synchronous converter |
| rotation | (noun) the act of rotating as if on an axis | Synonyms: rotary motion |
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| (noun) a planned recurrent sequence (of crops or personnel etc.) | - |
| (noun) a single complete turn (axial or orbital) | Synonyms: gyration, revolution |
| (noun) (mathematics) a transformation in which the coordinate axes are rotated by a fixed angle about the origin | - |
| rotavirus | (noun) the reovirus causing infant enteritis | - |
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| rote | (noun) memorization by repetition | Synonyms: rote learning |
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| rotenone | (noun) a white crystalline insecticide that has low toxicity for mammals; is used in home gardens; extracted from the roots of derris and cube | - |
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| rotgut | (noun) any alcoholic beverage of inferior quality | - |
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| rotifer | (noun) minute aquatic multicellular organisms having a ciliated wheel-like organ for feeding and locomotion; constituents of freshwater plankton | - |
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| rotisserie | (noun) a restaurant that specializes in roasted and barbecued meats | - |
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| (noun) an oven or broiler equipped with a rotating spit on which meat cooks as it turns | - |
| rotl | (noun) a unit of weight used in some Muslim countries near the Mediterranean; varies between one and five pounds | - |
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| rotogravure | (noun) using photography to produce a plate for printing | Synonyms: photogravure |
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| (noun) printing by transferring an image from a photogravure plate to a cylinder in a rotary press | - |
| (noun) printed material (text and pictures) produced by an intaglio printing process in a rotary press | - |
| rotor | (noun) rotating mechanism consisting of an assembly of rotating airfoils | - |
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| (noun) the rotating armature of a motor or generator | Synonyms: rotor coil |
| (noun) the revolving bar of a distributor | - |
| rottenness | (noun) the quality of rotting and becoming putrid | Synonyms: putrescence |
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| (noun) in a state of progressive putrefaction | Synonyms: corruption, putrescence, putridness |
| rottenstone | (noun) a weathered and decomposed siliceous limestone; in powdered form it is used in polishing | Synonyms: tripoli |
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| rotter | (noun) a person who is deemed to be despicable or contemptible | Synonyms: bum, crumb, dirty dog, git, lowlife, puke, rat, scum bag, scumbag, skunk, so-and-so, stinker, stinkpot |
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| rotting | (noun) (biology) the process of decay caused by bacterial or fungal action | Synonyms: breakdown, decomposition, putrefaction, rot |
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| rotunda | (noun) a large circular room | - |
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| (noun) a building having a circular plan and a dome | - |
| rotundity | (noun) the roundness of a 3-dimensional object | Synonyms: globosity, globularness, rotundness, sphericalness, sphericity |
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| (noun) the fullness of a tone of voice | Synonyms: roundness |
| rotundness | (noun) the roundness of a 3-dimensional object | Synonyms: globosity, globularness, rotundity, sphericalness, sphericity |
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