Definition, synonyms and related words
An isomer of a benzene derivative having two substituents adjacent on the ring.
"The ortho isomer forms when two substituent groups are positioned next to each other on the benzene ring."
"The ortho on the football team was the first to make a big play in the game."
The word comes from the Greek prefix ortho- and originally meant straight or correct. It entered English as a combining form used to indicate correctness or proper alignment in various terms.