Webster's English Dictionary

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aldehyde

al.de.hyde \'al-d*-.hi-d\ \.al-d*-'hi-d-ik\ n [G aldehyd, fr. NL al. 
   dehyd., abbr. of alcohol dehydrogen]atum dehydrogenated alcohol : 
   ACETALDEHYDE; broadly : any of various highly reactive com pounds typified 
   by acetaldehyde and characterized by the group -CHO - al.de.hy.dic aj