English word hydronymy comes from English -onymy, English hydro-
| Dictionary entry | Language | Definition |
|---|---|---|
| -onymy | English (eng) | Used to form nouns describing the the study, formation, or use of words or names. |
| hydro- | English (eng) | (chemistry) hydrogen. (mineralogy) a hydrous compound. (zoology) Hydrozoa. Water. |
| hydronymy | English (eng) | The naming of bodies of water such as rivers and lakes. |