| ̷ ̷ ̷ ̷ at hemi- + noun
Etymology: hemi- (I) + acetal
: any of a class of compounds characterized by the grouping >C(OH)(OR) and usually formed as intermediate products in the preparation of acetals from aldehydes or ketones
an aldose is a favorable compound for the study of hemiacetals — C.D.Hurd
— see glycoside , monosaccharide