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A plural of vertex.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(in technical and scientific senses only) a plural of vertex
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
n., pl. -tex•es, -ti•ces (-təˌsiz)
1. the highest point; apex.
2. the top of the head.
3. a point in the celestial sphere toward which or from which the common motion of a group of stars is directed.
a. the point farthest from the base.
b. a point in a geometrical solid common to three or more sides.
c. the intersection of two sides of a plane figure.
[1560–70; < Latin: whirl, top (of the head), derivative of vert(ere) to turn]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.