Dragon
From Memory Alpha, the free Star Trek reference
The dragon is a legendary serpent-like creature from the myths of Europe and China on Earth.
There is also a real animal known as a dragon on Berengaria VII. Spock saw one when he visited the planet. (TOS: "This Side of Paradise") A Vulcan survey team had made note of the species as one of flying reptiles, over 200 meters in length, that breathe fire. (ENT: "Bound")
In 2269, Hikaru Sulu and Leonard McCoy were chased by a two-headed, fire-breathing dragon on the Shore Leave Planet when the planet's master computer was attempting to "turn off" the Enterprise landing party. After the master computer agreed to cease his pursuit, McCoy and Sulu were seen on the master computer's viewscreen enjoying a picnic with the dragon, Alice and the White Rabbit. (TAS: "Once Upon a Planet")
The Centerplace on Ligon II featured a sculpture of an animal looking very similar to a Chinese dragon. (TNG: "Code of Honor")
The holographic Leonardo da Vinci was so fascinated by Tuvok's Vulcan ears that he drew a picture of a dragon with a pointed Vulcan ear as a tail. (VOY: "Concerning Flight")
The Doctor compared Qatai's quest to kill the "telepathic pitcher plant" to dragon-slaying. (VOY: "Bliss")
An ancient Greek myth tells of a dragon that fell in battle, upon which its teeth took root in the ground and sprang back as warriors to continue the fight. In 2376, Chakotay compared the hundreds of bio-pods containing the last survivors of the Vaadwaur race to dragon's teeth. (VOY: "Dragon's Teeth")
