ortho

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or·tho

 (ôr′thō)
adj.
Orthochromatic.

[From ortho-.]

or•tho

(ˈɔr θoʊ)

adj.
pertaining to or occupying two adjacent positions in the benzene ring. Compare meta, para 2.
[1875–80; independent use of ortho-]

ortho-

1. a combining form meaning “straight,” “upright,” “right,” “correct”: orthodontics; orthopedic.
2.
a. a combining form used in the name of the most hydrated acid in a given series: orthoboric acid. Compare meta- (def. 2a), pyro- (def. 2a).
b. a combining form used in the names of benzene derivatives in which the substituting group occupies the ortho position in the benzene ring.
Also, esp. before a vowel, orth-.
[< Greek, comb. form of orthós straight, upright, correct]
References in periodicals archive ?
MED-TECH company Orthos has launched a bone substitute after receiving a funding boost to back its skeletal injury product development.
Consisting of the Ortho Vision and Ortho Vision Premium lines, which are based on customer aesthetics requirements, DigitalGlobe's ability to provide the best quality orthos, faster and easier than ever before is now better suited to satisfy the diversified product needs of a growing number of imagery users.
A newsletter named Orthos in Action has been published which is part of the company's 50 year celebrations of supplying machinery from the world's leading manufacturers.
Ortho-bionomy--from the Greek words orthos (straight), bios (life) and nomos (law)--was founded by Arthur Lincoln Pauls, a British osteopathic physician.