square planar molecule

square planar molecule

[′skwer ¦plā·nər ‚mäl·ə‚kyül]
(chemistry)
A molecule in which a central atom possesses four valence bonds directed to the corners of a square, with all atoms lying in the same plane.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.