hemiacetalWiktionary 原文构词拆分hemi-前缀Half.+acetal词根/词干词源说明From hemi- + acetal.释义（英文）名词 Noun(organic chemistry) Any of a class of compounds of general formula R1R2C(OH)OR' (where R' is not H and R1 or R2 is often hydrogen).词族派生词（4）dithiohemiacetalhemiacetalicmonothiohemiacetalthiohemiacetal