| ohne Hauch | Term used to designate the nonspreading growth of nonflagellated bacteria on agar media; also applied to somatic agglutination. See: O antigen. Origin: Ger. Without breath (05 Mar 2000) |
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| Ohngren's line | A theoretical plane passing between the medial canthus of the eye and the angle of the mandible; used as an arbitrary dividing line in classifying localised tumours of the maxillary sinus; tumours above the line invade vital structures early and have a poorer prognosis, whereas those below the line have a more favourable prognosis. (05 Mar 2000) |