| Reid's base line | <anatomy, radiology> A line drawn from the inferior margin of the orbit to the auricular point at the superior border of the orifice of the external auditory meatus and extending backward to the centre of the occipital bone. It is used as the zero plane in computed tomography. (05 Mar 2000) |
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| Reid, Robert | <person> Scottish anatomist, 1851-1939. See: Reid's base line. (05 Mar 2000) |