| Nagel | Willibald, A., German ophthalmologist and physiologist, 1870-1911. See: Nagel's test. (05 Mar 2000) |
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| Nagel's test | A test for colour vision in which the observer determines the relative amounts of red and green necessary to match spectral yellow; an instrument called Nagel's anomaloscope is used. (05 Mar 2000) |
| Nagele | Franz K., German obstetrician, 1777-1851. See: Nagele obliquity, Nagele's pelvis, Nagele's rule. (05 Mar 2000) |
| Nagele obliquity | Inclination of the foetal head in cases of flat pelvis, so that the biparietal diameter is oblique in relation to the plane of the pelvic brim, the anterior parietal bone presenting to the parturient canal. Synonym: anterior asynclitism. (05 Mar 2000) |
| Nagele's pelvis | An obliquely contracted or unilateral synostotic pelvis, marked by arrest of development of one lateral half of the sacrum, usually ankylosis of the sacroiliac joint on that side, rotation of the sacrum toward the same side, and deviation of the symphysis pubis to the opposite side. (05 Mar 2000) |
| Nagele's rule | Means of estimating date of delivery by counting back three months from the first day of the last menstrual period and adding seven days. (05 Mar 2000) |
| Nageli | Karl W. Von, Swiss botanist, 1817-1891. See: micelle. (05 Mar 2000) |