| chloroacetophenone | (noun) a tear gas that is weaker than CS gas but lasts longer | Synonyms: CN gas |
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| epiphenomenon | (noun) a secondary phenomenon that is a by-product of another phenomenon | - |
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| guenon | (noun) small slender African monkey having long hind limbs and tail and long hair around the face | Synonyms: guenon monkey |
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| noumenon | (noun) the intellectual conception of a thing as it is in itself, not as it is known through perception | Synonyms: thing-in-itself |
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| paregmenon | (noun) juxtaposing words having a common derivation (as in `sense and sensibility') | - |
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| penoncel | (noun) a small pennant borne on a lance | Synonyms: pennoncel, pennoncelle |
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| phenomenon | (noun) any state or process known through the senses rather than by intuition or reasoning | - |
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| (noun) a remarkable development | - |
| polypropenonitrile | (noun) acrylic resin used to make a strong soft crease-resistant fabric (trade name Acrilan) | Synonyms: Acrilan |
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| prolegomenon | (noun) a preliminary discussion inserted at the beginning of a book or treatise | - |
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| propenonitrile | (noun) a colorless liquid unsaturated nitrile made from propene | Synonyms: acrylonitrile, vinyl cyanide |
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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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| tenon | (noun) a projection at the end of a piece of wood that is shaped to fit into a mortise and form a mortise joint | - |
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| tenonitis | (noun) inflammation of a tendon | Synonyms: tendinitis, tendonitis |
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| xenon | (noun) a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts | Synonyms: atomic number 54, Xe |
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