nounWord forms: plural ˈy-ˌaxes (ˈwaɪˌæksiz
; wīˈakˌsēz) Geometry
1. the vertical, or more nearly vertical, axis in a plane Cartesian coordinate system, along which the ordinate is measured
2. a similar axis that is perpendicular to the x-axis and the z-axis of a three-dimensional Cartesian coordinate system
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.