x-height

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x-height

(ĕks′hīt′)
n. Printing
The height of a lowercase x.
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.

x-height

n
(Printing, Lithography & Bookbinding) printing the height of lower case letters of a typeface, without ascenders or descenders
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014