Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • Straight; upright; vertical: orthotropous.
  • Perpendicular: orthorhombic.
  • Correct; correction: orthopsychiatry.
  • The most fully hydrated form of an acid or of its salts: orthoboric acid.
  • Diatomic molecules in which the nuclei have the same spin direction: orthohydrogen.
  • 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • straight, right, proper
  • Having an extra proportion of water
  • in isomeric benzene derivatives, having the two substituents in adjacent positions (compare meta- and para-)
  • of any molecule of the form X2 in which the two nuclei have parallel spin

from the GNU version of the Collaborative International Dictionary of English

  • A combining form signifying straight, right, upright, correct, regular.
  • A combining form (also used adjectively)
  • The one of several acids of the same element (as the phosphoric acids), which actually occurs with the greatest number of hydroxyl groups. Cf. Normal.
  • Connection with, or affinity to, one variety of isomerism, characteristic of the benzene compounds; -- contrasted with meta- or para-; ; hence, designating any substance showing such isomerism.

from The Century Dictionary and Cyclopedia

  • n. An element in many words of Greek origin, its presence bringing in the sense of ‘straight,’ ‘upright,’ ‘right,’ ‘correct.’

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

Ancient Greek ὀρθός (orthos).

Examples

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