单词	hemiacetal
释义	hemiacetal noun hemi·​ac·​e·​tal ˌhe-mē-ˈa-sə-ˌtal  : any of a class of compounds characterized by the grouping C(OH)(OR) where R is an alkyl group and usually formed as intermediates in the preparation of acetals from aldehydes or ketones Word History First Known Use 1893, in the meaning defined above Medical Definition hemiacetal noun hemi·​ac·​e·​tal ˌhem-ē-ˈas-ə-ˌtal  : any of a class of compounds characterized by the group C(OH)(OR) where R is an alkyl group and usually formed as intermediates in the preparation of acetals from aldehydes or ketones
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