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1. any of a class of organic compounds formed by combination of an aldehyde molecule and two alcohol molecules. 2. CH3CH(OC2H5)2, a colorless, volatile liquid used as a solvent and in cosmetics.
Oh, for your other question-the difference between a hemiacetal or hemiketal and an acetal or ketal, is that the hemi means only one alkoxy group has added to the carbonyl-you will have a carbon with an-OR group and an-OH group attached to it.h, for your other question-the difference between a hemiacetal or hemiketal and an acetal or ketal, is that the hemi means only one alkoxy group has added to the carbonyl-you will have a carbon with an-OR group and an-OH group attached to it.