Ortho definition

ôrthō
Straight; upright; vertical.

Orthotropous.

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Ortho is defined as straight.

An example of ortho used as a prefix is in the word orthodontist.

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(med.) Correction of deformities.

Orthopedics.

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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.

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Characterized by substitutions in the 1, 2 position in the benzene ring.
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(chemistry) An isomer of a benzene derivative having two substituents adjacent on the ring.
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(photography, dated) An orthochromatic plate.
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(imaging) An orthophoto.
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(chemistry) Having an extra proportion of water.
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(chemistry) In isomeric benzene derivatives, having the two substituents in adjacent positions (compare meta- and para-)
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(physics) Of any molecule of the form X2 in which the two nuclei have parallel spin.
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Perpendicular.

Orthorhombic.

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Correct; correction.

Orthopsychiatry.

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The most fully hydrated form of an acid or of its salts.

Orthoboric acid.

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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.

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Straight, regular, upright.

Orthognathous.

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At right angles, perpendicular.

Orthorhombic.

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Proper, correct, standard.

Orthography.

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(astronomy) A certain type of flat eyepiece.
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Orthochromatic.
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Other Word Forms

Noun

Singular:
ortho
Plural:
orthos

Origin of ortho

  • < Gr orthos, straight < IE base *werdh-, to grow, climb, high > Sans várdhati, (he) grows

    From Webster's New World College Dictionary, 5th Edition

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

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

  • From ortho–

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

  • Ancient Greek ὀρθός (orthos).

    From Wiktionary