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 History of this Word

"ortho" is from "orthos" (straight, right) spoken by people of Greece starting about 1000 B.C.

Notes

In this sense, it is a word added to another word to form a new word.

More words with this prefix,
orthodromic
orthology
orthopedic
orthotropic

Words related to this meaning

grammar is modifier

"ortho-" is a type of prefix

Definition

A prefix added to the start of a word. Indicates that "normal", "perpendicular" or "right" modifies the word. Created to expand meanings. Can be used with many words to form new words.

Examples of how the word is used

ortho- illustration In the orthorhombic system, we will continue the 90 degree angular relationships between all 3 axes, but will vary the length of each individual axis.
ortho- illustration I chose an orthodontist close to my house who'd fixed my friend's teeth.