noun, plural drag·on·flies.
Regional variation note
Examples from the Web for dragonfly
They were in the deck-saloon of the Dragonfly, steaming southwards from Valencia.
A second dragonfly appeared, its body a vivid purple, and a third.The Mad Planet|Murray Leinster
"Yes sir," Dragonfly yelled to him from the rail fence where he was already half-way through.
The preparation had begun on the morning when Hillyard took the Dragonfly into the harbour of Palma.
Dragonfly heard that and said, "But who piled the chairs up on his desk and knocked the Christmas tree over and everything?"