ORTHO Definition & Meaning

ortho

[awr-thoh]

Phonetic (Standard)IPA

adjective

Chemistry.

pertaining to or occupying two adjacent positions in the benzene ring.

ortho-

a combining form occurring in loanwords from Greek, where it meant “straight,” “upright,” “right,” “correct” (orthodox ) and on this model used in the formation of compound words (orthopedic ).
Chemistry.��
1. a combining form used in the name of that acid in a given series of acids that contains the most water (orthoboric acid ).
2. a combining form used in the names of the salts of these acids: if the acid ends in -ic, the corresponding salt ends in -ate (orthoboric acid (H 3 BO3 ) and potassium orthoborate (K 3 BO3 )); if the acid ends in -ous, the corresponding salt ends in -ite (orthoantimonous acid (H 3 SbO3 ) and potassium orthoantimonite (K 3 SbO3 )).

ortho-

combining form

straight or upright
orthotropous
perpendicular or at right angles
orthoclastic
correct or right
orthodontics
orthodox
orthography
orthoptics
o-.��(often in italics) denoting an organic compound containing a benzene ring with substituents attached to adjacent carbon atoms (the 1,2- positions) Compare oarsman Compare oarsman
orthodinitrobenzene
denoting an oxyacid regarded as the highest hydrated form of the anhydride or a salt of such an acid See meta-
orthophosphoric acid
denoting a diatomic substance in which the spins of the two atoms are parallel See para- 1
orthohydrogen

Discover More

51�Թ� History and Origins

Origin of ortho¹

First recorded in 1875–80; independent use of ortho-

Origin of ortho²

< Greek, combining form of �ǰ��ٳ�ó�� straight, upright, correct

Discover More

51�Թ� History and Origins

Origin of ortho¹

from Greek orthos straight, right, upright

Discover More

Example Sentences

Examples have not been reviewed.

This process poses challenges including selective addition of bromine at the ortho position, difficulty working with certain chemical groups, and the tendency of o-bromobenzenethiols to oxidize easily in air releasing unpleasant odors.

From

Under normal conditions, ortho- and para-H2 are present in a 3:1 ratio, with ortho-H2 slightly more energetically unstable than para-H2.

From

But by the time police arrived at the LATTC/Ortho Institute Metro station around 3:45 p.m., the victim was gone.

From

In 2019, Cargle wrote an anonymous post on a live public document — called Ortho Match — that is regularly checked and updated by medical students applying to orthopedic surgery residencies.

From

I also thought about the way a pair of scientifically cushioned Triple-E ortho New Balances would've probably taken some of the pressure off my knees.

From

orthicon orthoboric acid

Browse