ortho

play
adjective or·tho \ ˈȯr-(ˌ)thō \

Definition of ortho

First Known Use of ortho

1904


Medical Dictionary

1

ortho

play
adjective or·tho \ ˈȯr-(ˌ)thō \

medical Definition of ortho

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

2

ortho

adjective

medical Definition of ortho


Seen and Heard

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

Love words? Need even more definitions?

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

WORD OF THE DAY

a strongly worded attack

Get Word of the Day daily email!

Test Your Vocabulary

Merriam-Webster's New Words Quiz—Fall 2017 Edition!

  • young-plant-shoots
  • Which of the following is a new sense of the word bunny?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

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!