Ortho Definition

ôrthō
adjective
Orthochromatic.
American Heritage
prefix
Straight; upright; vertical.
Orthotropous.
American Heritage
Perpendicular.
Orthorhombic.
American Heritage
Correct; correction.
Orthopsychiatry.
American Heritage
The most fully hydrated form of an acid or of its salts.
Orthoboric acid.
American Heritage
Of or relating to one of three possible isomers of a benzene ring with two attached chemical groups in which the carbon atoms with attached groups are adjacent.
Ortho-dibromobenzene.
American Heritage
affix
Straight, regular, upright.
Orthognathous.
Webster's New World
At right angles, perpendicular.
Orthorhombic.
Webster's New World
Proper, correct, standard.
Orthography.
Webster's New World
That acid (of a group containing the same nonmetallic element) which has the largest number of OH groups per atom of the nonmetal.
Orthophosphoric acid.
Webster's New World
Characterized by substitutions in the 1, 2 position in the benzene ring.
Webster's New World
noun

(chemistry) An isomer of a benzene derivative having two substituents adjacent on the ring.

Wiktionary

(astronomy) A certain type of flat eyepiece.

Wiktionary

(photography, dated) An orthochromatic plate.

Wiktionary

(imaging) An orthophoto.

Wiktionary

Other Word Forms of Ortho

Noun

Singular:
ortho
Plural:
orthos

Origin of Ortho

  • Middle English from Old French from Latin from Greek from orthos straight, correct, right

    From American Heritage Dictionary of the English Language, 5th Edition

  • Ancient Greek ὀρθός (orthos).

    From Wiktionary

  • From ortho–

    From American Heritage Dictionary of the English Language, 5th Edition

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