Try Our Apps
7 Cycling Words
a beam of particles of one kind selected from the group of particles produced when a beam of particles from an accelerator
strikes a target.
Based on the Random House Dictionary, © Random House, Inc. 2016.
Cite This Source
Discover our greatest slideshows
Six words that can ruin your...
The Origins of 8 Classic Summer...
Globetrotter's Glossary: 8 Travel...
Eight Election Words That Will Fit...
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 primary beam
primary atypical pneumonia
primary brain vesicle
primary care physician