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ortho- Definition

ortho- (ôr′t̸hō, -t̸hə)

  1. straight, regular, upright orthognathous
  2. at right angles, perpendicular orthorhombic
  3. proper, correct, standard orthography
  4. Chem.: usually italicized and hyphenated in chemical names ortho-aminobenzoic acid
    1. 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
    2. characterized by substitutions in the 1, 2 position in the benzene ring
  5. Med. correction of deformities orthopedics

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