A tentacle was a body appendage.
When the Third Doctor encountered the Nestene Consciousness immediately after his regeneration, it had grown itself a tentacled body. (TV: Spearhead from Space)
Kaled mutants possessed tentacles. (TV: Genesis of the Daleks, Dalek) Usually having twelve tentacles, this meant the Daleks primarily used a duodecimal counting system. (COMIC: The Organ Grinder)
Kroll was mutated after it consumed a segment of the Key to Time. It grew until it was a mile across and a hundred forty feet high, with over thirty tentacles on each side of its body. (TV: The Power of Kroll)
The Ood were a humanoid species with tentacles used for feeding purposes located on the lower portions of their faces. (TV: The Impossible Planet)
The Masters of Dorada used to be humanoid, but over many generations their bodies became giant brains while their limbs became four tentacles. They could generate electric charges through these tentacles. (PROSE: The Dream Masters)