• (a.) Of, pertaining to, or designating, an anhydride, C4H4O5, of tartaric acid, obtained as a white crystalline deliquescent substance.
Tar·trel'ic adjective [ From Tartar the chemical compound.] (Chemistry) Of, pertaining to, or designating, an anhydride, C 4 H 4 O 5 , of tartaric acid, obtained as a white crystalline deliquescent substance.