SalicylalSal"i*cyl`al\, n. [Salicylic + aldehide.] (Chem.) A thin, fragrant, colorless oil, HO.C6H4.CHO, found in the flowers of meadow sweet (Spir[ae]a), and also obtained by oxidation of salicin, saligenin, etc. It reddens on exposure. Called also salicylol, salicylic aldehyde, and formerly salicylous, or spiroylous, acid.
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