Definition of "ortho" []

• Orthochromatic. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "This method subsequently led to a fundamental investigation of neutron scattering in ortho - and para-hydrogen, with Pitzer, and to the first measurement, with Bloch, of the magnetic moment of the neutron."
• "” 5 Certain German orthoëpists, despairing of the printed page, have turned to the phonograph, and there is a Deutsche Grammophon-Gesellschaft in Berlin which offers records of specimen speeches in a great many languages and dialects, including English."
• "The on-call ortho gave her a local anesthetic, reset it and her finger."