Scrabble Dictionary

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Yes, ordinate is playable

...and is worth 10 points.

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"Ordinate" Definition

noun

The plane Cartesian coordinate representing the distance from a specified point to the x-axis, measured parallel to the y-axis.
The Cartesian coordinate obtained by measuring parallel to the y-axis .

adjective

Arranged in regular rows, as the spots on the wings of an insect.