The Collaborative International Dictionary
Hemimellitic
Hemimellitic \Hem`i*mel*lit"ic\, a. [Hemi- + mellitic.] (Chem.) Having half as many (three) carboxyl radicals as mellitic acid; -- said of an organic acid.
Wiktionary
hemimellitic
a. (context chemistry English) Having half as many (three) carboxyl radicals as mellitic acid.