| butane | (noun) occurs in natural gas; used in the manufacture of rubber and fuels | - |
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| castanets | (noun) (used in the plural) a percussion instrument consisting of a pair of hollow pieces of wood or bone (usually held between the thumb and fingers) that are made to click together (as by Spanish dancers) in rhythm with the dance | Synonyms: bones, clappers, finger cymbals |
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| etanercept | (noun) a genetically engineered anti-TNF compound (trade name Enbrel) consisting of receptors that bind TNF; it is injected twice a week in the treatment of rheumatoid arthritis | Synonyms: Enbrel |
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| fontanel | (noun) any membranous gap between the bones of the cranium in an infant or fetus | Synonyms: fontanelle, soft spot |
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| fontanelle | (noun) any membranous gap between the bones of the cranium in an infant or fetus | Synonyms: fontanel, soft spot |
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| heptane | (noun) a colorless volatile highly flammable liquid obtained from petroleum and used as an anesthetic or a solvent or in determining octane ratings | - |
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| instantaneousness | (noun) the quickness of action or occurrence | Synonyms: immediacy, immediateness, instancy |
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| octane | (noun) any isomeric saturated hydrocarbon found in petroleum and used as a fuel and solvent | - |
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| simultaneity | (noun) happening or existing or done at the same time | Synonyms: simultaneousness |
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| simultaneousness | (noun) happening or existing or done at the same time | Synonyms: simultaneity |
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| soutane | (noun) a long cassock with buttons down the front; worn by Roman Catholic priests | - |
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| spontaneity | (noun) the quality of being spontaneous and coming from natural feelings without constraint | Synonyms: spontaneousness |
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| spontaneousness | (noun) the quality of being spontaneous and coming from natural feelings without constraint | Synonyms: spontaneity |
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| tanekaha | (noun) medium tall celery pine of New Zealand | Synonyms: Phyllocladus trichomanoides |
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| tramontane | (noun) a cold dry wind that blows south out of the mountains into Italy and the western Mediterranean | Synonyms: tramontana |
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| ultramontane | (noun) a Roman Catholic who advocates ultramontanism (supreme papal authority in matters of faith and discipline) | - |
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