Word of the Day
Apps by Dictionary
A lot vs. Alot: 9 Grammatical Pitfalls
the technique of establishing precise reference lines and planes by means of telescopic sights, especially for the purpose of aligning machinery, machine-shop work, etc.
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Discover our greatest slideshows
9 Words to Help You Navigate the...
7 Chinese Loanwords to Expand Your...
Poodle, Basset & Beagle: 10 Dog...
A Look at 8 Expressions with Heart
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
There is an optical illusion about every person we meet.
Ralph Waldo Emerson
Dear friend, I will have to sink with hundreds of others on a dumbwaiter into hell. I will be a...
What is the use of "good" painting? We want a spell cast upon the optical part of our existence! We...
Nearby words for optical-tooling
optical mark reader
optical mark reading
optical sound recording
optical storage technology association
optical time domain reflectometer
optical time domain reflectometry
optimal flexible architecture