Liver

A liver was an organ.

In Mesopotamia, the livers of animals sacrificed to Ishtar were used for divination. (PROSE: Timewyrm: Genesys)

In the 1890s, a Clockwork Droid scanned the Twelfth Doctor, and listed organs they could harvest, as items on the menu at Mancini's Family Restaurant: liver, spleen, brain stem, eyes, lungs and skin. (TV: Deep Breath)

Alfred took the liver, kidneys and spleen of his first victim with the intention of using them to revive Julius Quilter when he died. (HOMEVID: Unnatural Selection)

The Seventh Doctor once claimed that megalomaniacs got that way from being forced to eat liver as children and thus getting too much vitamin A. (PROSE: Cat's Cradle: Witch Mark)