See Also: ortho-(medicine)
ortho-(dictionary)
ortho(dictionary)
Ortho-est(health)
Ortho cyclen-28(health)
Ortho-novum 1-80 28(health)
Ortho-novum 10-11-21(health)
Ortho-novum 10-11-28(health)
Ortho-novum 10-21(health)
Ortho-novum 2-21(health)

ortho (iou)



ortho adjective & adverb. Freq. italicized. L19
[from ORTHO-.]
A. adjective.
Chemistry. Characterized by or relating to (substitution at) two adjacent carbon atoms in a benzene ring; at a position adjacent to some (specified) substituent in a benzene ring. L19.
Photography. Orthochromatic. E20.
b. adverb. Chemistry. So as to form ortho-substituted compounds. M20.