green water

noun

Definition of green water

1 : the water in shore on soundings — compare blue water
2 : green sea
3 : an opaque greenish condition of the water in an aquarium that is caused by excessive growth of algae and that is harmless and usually healthful to fishes

Love words?

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:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of green water

1854, in the meaning defined at sense 3

Keep scrolling for more

Learn More about green water

Statistics for green water

Look-up Popularity

Time Traveler for green water

The first known use of green water was in 1854

See more words from the same year

Comments on green water

What made you want to look up green water? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to shake or wave menacingly

Get Word of the Day daily email!

Test Your Vocabulary

Summer 2019 Words of the Day Quiz

  • a-bowl-of-peach-sorbet-with-cut-peaches-next-to-it
  • Which is a synonym of desideratum?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Add Diction

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!