ortho

adjective

or·​tho ˈȯr-(ˌ)thō How to pronounce ortho (audio)

Word History

First Known Use

1904, in the meaning defined above

Time Traveler
The first known use of ortho was in 1904

Dictionary Entries Near ortho

Cite this Entry

“Ortho.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ortho. Accessed 28 Mar. 2024.

Medical Definition

ortho

1 of 2 adjective
or·​tho ˈȯr-(ˌ)thō How to pronounce ortho (audio)
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

2 of 2 adjective
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