tannigen

from The Century Dictionary.

• noun A trade-name of acetyl-tannin, a yellowish-gray powder without smell or taste, used medicinally as an astringent remedy by both external and internal application.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Pharm.) A compound obtained as a yellowish gray powder by the action of acetyl chloride or acetic anhydride or ordinary tannic acid. It is used as an intestinal astringent, and locally in rhinitis and pharyngitis.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun obsolete, medicine An acetyl derivative of tannic acid once used as an astringent