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abscisscissae

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ab⋅scis⋅sa

  [ab-sis-uh]
Use abscisscissae in a Sentence
–noun, plural -scis⋅sas, -scis⋅sae  [-sis-ee] . Mathematics.
(in plane Cartesian coordinates) the x-coordinate of a point: its distance from the y-axis measured parallel to the x-axis.
Compare ordinate.

Origin:
1690–1700; fem. of L abscissus (ptp. of abscindere to abscind )
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Word Origin & History

abscissa 
1698, from L. abscissa (linea) "(a line) cut off," from fem. pp. of abscindere "to cut off," from ab- "off, away" + scindere "to cut" (see shed (v.)).
Online Etymology Dictionary, © 2001 Douglas Harper
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