English Explanatory Dictionary

ortho-

English dictionary entry

Meanings

prefix
  1. Right angle, perpendicular.
  2. Proper, righteous, pure.
  3. To correct or fix.
  4. Same, from the same.
  5. Normal, ordinary.
  6. Straight in form.
  7. Orthorhombic crystal structure.
  8. In isomeric benzene derivatives, having the two substituents in adjacent (1,2) positions (compare meta- and para-).
  9. Having an extra proportion of water.
  10. Independent, separate.
  11. Original, primary.
  12. Parallel lines or columns.

Pronunciation

/ɔː.θə-/ /ɔːˈθɒ-/ /oɹ.θə-/ /oɹˈθɑ-/ LL-Q1860 (eng)-Flame, not lame-ortho-.wav

Word forms

ortho- orth-

Etymology

Learned borrowing from Ancient Greek ὀρθός (orthós).

Synonyms

cross- eu- fix- ipsi- normo- recti- proto- para- igneo-

Derived words

orthoacid orthoaluminate orthoarsenite orthoborate orthoferrite orthonitrate orthonitric acid orthoperiodate orthoperiodic orthophosphate orthophosphite orthophosphoric acid orthosilicate orthocclusion orthocephalic orthochess orthodromic orthograft orthogravitropism orthophemistic orthophosphoric orthopia orthoacetate orthobenzoate orthocarbonate orthoester orthoformate orthocharmonium orthoexciton orthohelium orthohydrogen orthopositronium orthoquarkonium orthochromatic orthoevolution orthogenesis orthogenic orthographical orthography orthology orthometry orthomolecular orthonym orthopathy orthophony orthoploid orthoprax orthopsychology orthorexia orthoselection orthosexual orthosexuality orthosomnia orthotaxon orthobicupola orthofluvial orthographic ortholinear orthomegodont orthostyle
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