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Salicylal

Definition: A thin, fragrant, colorless oil, HO.C6H4.CHO, found in
the flowers of meadow sweet (Spiraea), and also obtained by oxidation
of salicin, saligenin, etc. It reddens on exposure. Called also
salicylol, salicylic aldehyde, and formerly salicylous, / spiroylous,
acid.