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Mathematics A straight line segment passing through the center of a figure, especially of a circle or sphere, and terminating at the periphery.
(noun)
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Mathematics The length of such a segment.
(noun)
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Thickness or width.
(noun)
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A unit for measuring the magnifying power of a microscope lens or telescope, equal to the number of times an object's linear dimensions are apparently increased.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.