Word of the Day
Apps by Dictionary
What does Boxing Day have to do with boxing?
energy, as electricity or nuclear power, that does not pollute the atmosphere when used, as opposed to coal and oil, that do.
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
Examples from the web for
Now it's the dirtiest word in the
So would abundant supplies of cheap, reliable, and
It is a
source that can be used in fuel cells.
But, at the same time, no other country has invested as much in
Better understand the need for
and learn how to be part of the solution.
Wind is a
source that is endlessly renewable and remarkably reliable.
Write to your energy company to ask for
Water shortages could mean trouble in our race to find enough
to fuel the planet.
No other country is investing so heavily in
The best news in the fight against climate change is that business is starting to invest in
Discover our greatest slideshows
The 12 Days of Christmas
Mangers and Myrrh: The Language of...
Light Up Your Language for the...
Crack the Christmas Code: Carols...
Browse more topics on our blog
What Is the Difference Between Discreet and Discrete?
Learn the correct uses of these two commonly confused homophones.
What Character Was Removed from the Alphabet?
What mistaken pronunciation gave this character its name?
This small mark has two primary uses: to signify possession or omitted letters.
How Do I Get a Word into the Dictionary?
People invent new words all the time, but which ones actually make it?
Word of the Day
Difficulty index for
Few English speakers likely know this word
Word Value for
Words With Friends
Nearby words for clean energy
clayton antitrust act
clean and green
clean and jerk
clean as a whistle
clean bill of health
clean hands, have
clean someone out
clean someone's clock
clean up on someone
clean up one's act
clean up the floor with someone