Gain access to thousands of additional definitions and advanced search features—ad free! JOIN NOW
: names of bodies of water
You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Start your free trial today and get unlimited access to America's largest dictionary, with:
International Scientific Vocabulary hydr- + -onymy
Keep scrolling for more
Resources for hydronymy
Comments on hydronymy
What made you want to look up hydronymy? Please tell us where you read or heard it (including the quote, if possible).
occurring twice a year or every two years
Get Word of the Day daily email!
Name that Food Quiz
Test your knowledge - and maybe learn something along the way.
Test Your Knowledge - and learn some interesting things along the way.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Words from the week of 9/14/2018
For frog-tossing, sword dancing, & more
That dessert might kill you
How a folk song became a term of derision.
And is one way more correct than the others?
The story of an imaginary word that managed to sneak past our editors and enter the dictionary.
How to use a word that (literally) drives some people nuts.
The awkward case of 'his or her'
Test your knowledge of food and food words.
A quiz in common time.
SCRABBLE® fans, sharpen your skills!