| appendicularia | (noun) free-swimming tadpole-shaped pelagic tunicate resembling larvae of other tunicates | - |
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| dicumarol | (noun) an anticoagulant drug that has now been largely replaced by warfarin | Synonyms: dicoumarol |
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| modicum | (noun) a small or moderate or token amount | - |
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| pandiculation | (noun) yawning and stretching (as when first waking up) | - |
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| pediculicide | (noun) a chemical agent that kills lice | - |
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| pediculosis | (noun) infestation with lice (Pediculus humanus) resulting in severe itching | Synonyms: lousiness |
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| pedicure | (noun) professional care for the feet and toenails | - |
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| perpendicular | (noun) an extremely steep face | - |
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| (noun) a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point | Synonyms: plumb line |
| (noun) a Gothic style in 14th and 15th century England; characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting | Synonyms: English-Gothic, English-Gothic architecture, perpendicular style |
| (noun) a straight line at right angles to another line | - |
| perpendicularity | (noun) the quality of being at right angles to a given line or plane (especially the plane of the horizon) | - |
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| (noun) the relation of opposition between things at right angles | Synonyms: orthogonal opposition, orthogonality |
| radiculitis | (noun) inflammation of the radicle of a nerve | - |
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| ridicule | (noun) the act of deriding or treating with contempt | Synonyms: derision |
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| (noun) language or behavior intended to mock or humiliate | - |
| ridiculer | (noun) a humorist who uses ridicule and irony and sarcasm | Synonyms: ironist, satirist |
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| ridiculousness | (noun) a message whose content is at variance with reason | Synonyms: absurdity, absurdness |
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