picromel

from The Century Dictionary.

• noun A bitter-sweet substance obtained from bile.

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

• noun (Old Chem.) A colorless viscous substance having a bitter-sweet taste.

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

• noun chemistry, obsolete A colourless viscous substance having a bittersweet taste, formerly supposed to be the essential principle of bile, but later identified as a mixture, principally of salts of glycocholic acid and taurocholic acid.