pyramidal molecule
pyramidal molecule
[¦pir·ə‚mid·əl ′mäl·ə‚kyül] (chemistry)
A molecular structure in the shape of a pyramid in which the central atom at the peak possesses either three or four valence bonds that are directed to the other atoms, which form the base of the pyramid.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.