| alcahest | (noun) hypothetical universal solvent once sought by alchemists | Synonyms: alkahest, universal solvent |
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| alcalde | (noun) a mayor or chief magistrate of a Spanish town | - |
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| alcalescent | (adjective) tending to become alkaline; slightly alkaline | Synonyms: alkalescent |
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| alcapton | (noun) an acid formed as an intermediate product of the metabolism of tyrosine and phenylalanine | Synonyms: alkapton, homogentisic acid |
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| alcaptonuria | (noun) a rare recessive metabolic anomaly marked by ochronosis and the presence of alkapton in the urine | Synonyms: alkaptonuria |
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| alcazar | (noun) any of various Spanish fortresses or palaces built by the Moors | - |
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