any of the class of organic chemical compounds having the general formula RCH(OH)OR, where R is an organic group.

1890–95; hemi- + acetal

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hemiacetal hem·i·ac·e·tal (hěm'ē-ās'ĭ-tāl')
Any of a class of compounds containing an alkyl group, especially when formed as intermediates during the preparation of acetals from aldehydes or ketones.

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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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