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Related to diametral: Diametral Pitch
1. Abbr. d or diam. Mathematics
a. A straight line segment passing through the center of a figure, especially of a circle or sphere, and terminating at the periphery.
b. The length of such a segment.
2. Thickness or width.
3. A unit of magnification equal to the number of times an object's linear dimensions is increased by the magnifying apparatus.
[Middle English diametre, from Old French, from Latin diametrus, from Greek diametros (grammē), diagonal (line) : dia-, dia- + metron, measure; see mē- in Indo-European roots.]
di·am′e·tral (-trəl) adj.
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.
1. (Mathematics) located on or forming a diameter: diametral plane.
2. (Mathematics) a less common word for diametric
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014