Tannic /(?)/

Tan·nic

Tannic

a.
  1. Of or pertaining to tan; derived from, or resembling, tan; as, tannic acid.

Phrases & Compounds
Tannic acid
An acid obtained from nutgalls as a yellow amorphous substance, C14H10O9, having an astringent taste, and forming with ferric salts a bluish-black compound, which is the basis of common ink. Called also tannin, and gallotannic acid.