z-axis: Meaning and Definition of
z-ax•is
Pronunciation: (zē'ak"sis), [key]
— pl. z-ax•es
- (in a three-dimensional Cartesian coordinate system) the axis along which values of z are measured and at which both x and y equal zero.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.