gyration vector

gyration vector

[ji′rā·shən ¦vek·tər]
(optics)
For light propagating in an optically active medium, a vector whose cross product with the time derivative of the electric displacement vector gives a negative contribution to the electric field.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The key quantity of this theory is the gyration vector of the turbulent flow field [OMEGA] (Fig.