rotation /ro·ta·tion/ (ro-ta´shun) the process of turning around an axis. In obstetrics, the turning of the fetal head (or presenting part) for proper orientation to the pelvic axis.ro´taryro´tatory
optical rotation (
pˑ·t
·kl rō·tāˑ·shn),
optical rotation the quality of certain optically active substances whereby the plane of polarized light is changed, so that it is rotated in an arc the length of which is characteristic of the substance.
van Ness rotation fusion of the knee joint and rotation of the ankle to function as the knee; done to correct a congenitally missing femur.
| optical rotation n. The change or rotation in the plane of polarization that occurs when polarized light is passed through an optically active substance. |
optical rotation (
pˑ·t·kl rō·tāˑ·shn),n the angle by which plane-polarized light rotates when it passes through a substance that exhibits optical activity. This is a distinguishable quality of a particular compound. See also optical activity.
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