name of a body of water
Hydronym
A hydronym is the proper name of a body of water, such as a river, lake, sea or ocean. Lake Ontario, Mississippi River and Pacific Ocean are all hydronyms. If “Lake America” is used as the proper name of the lake, it also functions as a hydronym. The term describes the kind of name; it does not decide whether every country or organization accepts that name.
Why now
On August 27, 2026, Canadian Prime Minister Mark Carney responded to the U.S. order directing federal use of Lake America for Lake Ontario. In that response, he referred to changes in America’s ‘hydronyms.’ Most people do not use the word in everyday conversation. A specialist term suddenly appeared in a widely reported political dispute, sending readers to look up what it meant. The word itself is not new; the sudden mass exposure was new.
More context
Context
Is a Hydronym a Place Name?
Yes, more specifically a water-place name.
- A toponym is a proper name for a geographic place or feature.
- A hydronym is the proper name of a body of water.
Hydronyms are therefore a type of toponym. Toronto is a toponym but not a hydronym; Lake Ontario is both.
Is “Lake America” a Hydronym?
Yes, when the phrase is used as the proper name of the lake. Whether that name is accepted by Canada, international organizations, map companies or the public is a separate issue.
This distinction matters because the dispute is about which proper name different authorities use for the same shared body of water.
See what the Lake America order changed — and what it did not change.
Do Not Confuse These Words
- Hydronym: a proper name of a body of water, such as Lake Ontario.
- Hyponym: a more specific word whose meaning falls inside a broader category; for example, “horse” is a hyponym of “animal.”
- Hydronium: a chemistry term for the positively charged ion commonly written as H₃O⁺.
A quick memory aid is hydro + name: hydronym means a water name.
Is “Hydronym” a New Word?
No. It is an established specialist term used in linguistics, geography and the study of place names. The study of names is called onomastics; the study of place names is toponymy; and the study of water names is hydronymy.
The August 2026 news did not create the word. It put the word in front of a much larger audience than usual.
Quick Answers
Is “river” a hydronym? No. “River” is a common noun. A specific proper name such as “Mississippi River” is a hydronym.
Is every hydronym a toponym? Yes. Hydronym is the more specific category for named water features.
Are Lake Ontario and Lake America both hydronyms? Yes, when each phrase is used as a proper name for the lake. That does not mean the two names have equal official status in every country or system.
Keep exploring
Related Things
Evidence
Sources
- Hydronym — Cambridge Dictionary
Supports the definition of hydronym as the proper name of a body of water.
- Trump signs executive order to rename Lake Ontario “Lake America” — CBS News
Supports the Canadian response and the reported use of the word hydronyms in the current naming dispute.