| acetaldehyde | (noun) a colorless volatile water-soluble liquid aldehyde used chiefly in the manufacture of acetic acid and perfumes and drugs | Synonyms: ethanal |
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| alcalde | (noun) a mayor or chief magistrate of a Spanish town | - |
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| aldehyde | (noun) any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acids | - |
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| alder | (noun) north temperate shrubs or trees having toothed leaves and conelike fruit; bark is used in tanning and dyeing and the wood is rot-resistant | Synonyms: alder tree |
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| (noun) wood of any of various alder trees; resistant to underwater rot; used for bridges etc | - |
| alderfly | (noun) dark-colored insect having predaceous aquatic larvae | Synonyms: alder fly, Sialis lutaria |
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| alderman | (noun) a member of a municipal legislative body (as a city council) | - |
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| balderdash | (noun) trivial nonsense | Synonyms: fiddle-faddle, piffle |
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| caldera | (noun) a large crater caused by the violent explosion of a volcano that collapses into a depression | - |
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| falderol | (noun) ornamental objects of no great value | Synonyms: folderal, frill, gimcrack, gimcrackery, nonsense, trumpery |
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| formaldehyde | (noun) a colorless poisonous gas; made by the oxidation of methanol | Synonyms: methanal |
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| furfuraldehyde | (noun) a liquid aldehyde with a penetrating odor; made from plant hulls and corncobs; used in making furan and as a solvent | Synonyms: furfural |
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| glyceraldehyde | (noun) a sweet crystalline aldehyde formed by the breakdown of sugars | Synonyms: glyceric aldehyde |
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| paraldehyde | (noun) a colorless liquid (a cyclic trimer of acetaldehyde) that is used as a sedative and a solvent | Synonyms: ethanal trimer |
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| propionaldehyde | (noun) a colorless liquid aldehyde | Synonyms: propanal |
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| valdecoxib | (noun) a Cox-2 inhibitor (trade name Bextra) that relieves pain and inflammation without harming the digestive tract | Synonyms: Bextra |
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