Definitions

1. noun

a tail resembling that of a dragon, often found on a bird or other animal, or a streamer or appendage resembling a dragon’s tail, especially a streamer of flame

“The peacock’s magnificent plumage included a magnificent dragontail that shimmered in the sunlight.”

2. noun

a long, tapering streamer of flame, smoke, or vapor, resembling a dragon’s tail

“The erupting volcano produced a mighty dragontail of fire and ash that rose high into the sky.”