ortho

adjective
or·tho | \ˈȯr-(ˌ)thō \

Definition of ortho 

First Known Use of ortho

1904, in the meaning defined above

Keep scrolling for more

Learn More about ortho

Statistics for ortho

Look-up Popularity

Time Traveler for ortho

The first known use of ortho was in 1904

See more words from the same year

Keep scrolling for more

More Definitions for ortho

ortho

adjective
or·tho | \ˈȯr-(ˌ)thō \

Medical Definition of ortho 

(Entry 1 of 2)

1 : derived from or being an acid in the highest hydrated or hydroxylated form known

2 : relating to, characterized by, or being two neighboring positions in the benzene ring

ortho

adjective

Medical Definition of ortho (Entry 2 of 2)

Comments on ortho

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

WORD OF THE DAY

not any or not one

Get Word of the Day daily email!

Test Your Vocabulary

Great Scrabble Words—A Quiz

  • scrabble-tiles-that-read-scrabble-quiz
  • Which of the following Q-without-U words means the number five in cards or dice?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Bee Cubed

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!