a large imaginary animal that has wings and a long tail and can breathe out fire.——朗文当代大辞典

A mythical monster, represented as a huge and terrible reptile, usually combining ophidian and crocodilian structure, with strong claws, like a beast or bird of prey, and a scaly skin; it is generally represented with wings, and sometimes as breathing out fire. The heraldic dragon combines reptilian and mammalian form with the addition of wings.——牛津当代大辞典  @en