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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.
is that hemiacetal is (chemistry) any of a class of compounds of general formula r 2 c(oh)or' (where r' is not h) while acetal is (organic chemistry) any diether of a geminal diol, r 2 c(or') 2 (where r' does not = h).Hemiacetal is a see also of acetal. As nouns the difference between hemiacetal and acetal.s that hemiacetal is (chemistry) any of a class of compounds of general formula r 2 c(oh)or' (where r' is not h) while acetal is (organic chemistry) any diether of a geminal diol, r 2 c(or') 2 (where r' does not = h).