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del operator[′del ‚äp·ə‚rād·ər]
The rule which replaces the function ƒ of three variables, x, y, z, by the vector valued function whose components in the x, y, z directions are the respective partial derivatives of ƒ. Written ∇ƒ. Also known as nabla.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.