| cyclopropane | (noun) a colorless flammable gas sometimes used as an inhalation anesthetic | - |
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| isopropanol | (noun) alcohol used as antifreeze or a solvent | Synonyms: isopropyl alcohol |
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| opopanax | (noun) an odorous gum resin formerly used in medicines | - |
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| phenylpropanolamine | (noun) an adrenergic drug used in many preparations to relieve allergic reactions or respiratory infections | - |
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| propanal | (noun) a colorless liquid aldehyde | Synonyms: propionaldehyde |
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| propanamide | (noun) the amide of propionic acid (C2H5CONH2) | Synonyms: proprionamide |
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| propane | (noun) colorless gas found in natural gas and petroleum; used as a fuel | - |
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| propanediol | (noun) a sweet colorless, viscous, hygroscopic liquid used as an antifreeze and in brake fluid and also as a humectant in cosmetics and personal care items although it can be absorbed through the skin with harmful effects | Synonyms: propylene glycol |
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| propanol | (noun) a clear colorless volatile liquid (alcohol) used as a solvent and antiseptic | Synonyms: propyl alcohol |
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| propanone | (noun) the simplest ketone; a highly flammable liquid widely used as an organic solvent and as material for making plastics | Synonyms: acetone, dimethyl ketone |
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| tragopan | (noun) brilliantly colored Asian pheasant having wattles and two fleshy processes on the head | - |
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