Tongue

The tongue was a body part used for tasting and communication. According to the Sixth Doctor, the tongue contained 10,000 sensory receptors, greatly dwarfing the nose's 400. (AUDIO: The Carrionite Curse)

Agamemnon ordered Odysseus to have Steven Taylor's tongue cut out for insolence before ending him, but the First Doctor stopped this from happening. (TV: The Myth Makers)

After finding and taking a black orchid while on an expedition in the Amazon, botanist George Cranleigh was captured by the Kojabe tribe. Believing the orchid sacred, they mutilated Cranleigh and cut out his tongue for the crime of theft. (TV: Black Orchid)

Some Time Lords could determine what was in a substance by touching it to their tongue. Romana II tasted a mineral with her tongue on Skaro to guess its composition. (TV: Destiny of the Daleks) The Tenth Doctor was able to tell not only that the Sycorax were using blood control, but what blood type they were using by tasting it. (TV: The Christmas Invasion) While visiting Queen Victoria, he could tell there was mistletoe oil on some woodwork by licking it. (TV: Tooth and Claw) Similarly, the Eleventh and Thirteenth Doctors also determined geographic location of Earth, among other things, by tasting grass and soil. (TV: The Hungry Earth, It Takes You Away) While visiting Villa Diodati in June 1816, the Thirteenth Doctor tasted the powdery remains of a bony hand in order to determine its origin. (TV: The Haunting of Villa Diodati)

Certain species could use their tongues as weapons. Tetraps had a forked tongue which could inject a paralysing poison. (PROSE: Time and the Rani) One tribe of Silurians encountered in Wales had long tongues which they could flick to inject a venom, which was mutagenic to humans. (TV: The Hungry Earth/Cold Blood) Zygons had venom sacs in their tongues. (TV: The Day of the Doctor)