Source : Webster's Revised Unabridged Dictionary (1913)

Salicylal \Sal"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}.