y-axis

y-axis
/wuy"ak'sis/, n., pl. y-axes /wuy"ak'seez/. Math.
1. Also called axis of ordinates. (in a plane Cartesian coordinate system) the axis, usually vertical, along which the ordinate is measured and from which the abscissa is measured. See diag. under ordinate.
2. (in a three-dimensional Cartesian coordinate system) the axis along which values of y are measured and at which both x and z equal zero.
[1925-30]

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Universalium. 2010.

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