The story
- Proto-Indo-European*bʰeh₂-
- Proto-Indo-European*bʰh₂nyéti
- Proto-Hellenic*pʰáňňō
- Ancient Greekφαίνω (phaínō)
- Ancient Greekφαινόμενον (phainómenon)
- Late Latinphaenomenon
- Englishphenomenon
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Ancient Greekφαινόμενον (phainómenon)
- Frenchphénomène
- Frenchphénoména
- English todayphenomenal
From phenomenon + -al, after French phénoménal.
Etymology from Wiktionary, CC BY-SA 4.0.