n.pl. ab·scis·sas or ab·scis·sae(-sise)
Symbol xThe coordinate representing the position of a point along a line perpendicular to the y-axis in a plane Cartesian coordinate system.
[New Latin(linea) abscissa, (line) cut off, fromLatinabscissa, feminine past participle ofabscindere, to abscise; see ABSCISSION.]
(click for a larger image)abscissa
The coordinates for A are (4,3); the abscissa is 4 and the ordinate is 3.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.