| acrolein | (noun) a pungent colorless unsaturated liquid aldehyde made from propene | Synonyms: propenal |
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| mullein | (noun) any of various plants of the genus Verbascum having large usually woolly leaves and terminal spikes of yellow or white or purplish flowers | Synonyms: flannel leaf, velvet plant |
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| olein | (noun) a naturally occurring glyceride of oleic acid that is found in fats and oils | Synonyms: triolein |
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| phenolphthalein | (noun) a laxative used in many preparations under various trade names; also used as an acid-base indicator in titrations involving weak acids and strong bases because it is brilliant red at high alkalinity and colorless below pH 8 | - |
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| resorcinolphthalein | (noun) a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed) | Synonyms: fluorescein, fluoresceine, fluorescent dye |
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| terreplein | (noun) level space where heavy guns can be mounted behind the parapet at the top of a rampart | - |
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| triolein | (noun) a naturally occurring glyceride of oleic acid that is found in fats and oils | Synonyms: olein |
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| villein | (noun) (Middle Ages) a person who is bound to the land and owned by the feudal lord | Synonyms: helot, serf |
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