The story
- Proto-Indo-European*derḱ-
- Proto-Hellenic*dérkomai
- Ancient Greekδέρκομαι (dérkomai)
- Ancient Greekδράκων (drákōn)
- Latindracō
- Old Frenchdragon
- Middle Englishdragoun
- Englishdragon
- Proto-Indo-European*plew-
- Proto-Indo-European*plewk-
- Proto-Indo-European*pléwketi
- Proto-Germanic*fleuganądeverb.
- Proto-Germanic*fleugǭ
- Proto-West Germanic*fleugā
- Old Englishflēoge
- Middle Englishflye
- Englishfly
- English todaydragonfly
From dragon + fly. Compare the piecewise doublet drakefly (“mayfly”).
Etymology from Wiktionary, CC BY-SA 4.0.