Latin word aqua comes from Proto-Indo-European *h₁egʷʰ-, Proto-Indo-European *h₂ekʷeh₂, and later Proto-Indo-European *h₂ékʷeh₂ (Water.)
| Dictionary entry | Language | Definition |
|---|---|---|
| *h₁egʷʰ- | Proto-Indo-European (ine-pro) | |
| *h₂ekʷeh₂ | Proto-Indo-European (ine-pro) | |
| *h₂ékʷeh₂ | Proto-Indo-European (ine-pro) | Water. |
| *akʷā | Proto-Italic (itc-pro) | Water. |
| aqua | Latin (lat) | Water. |