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The outer or the topmost boundary of an object.
(noun)
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A material layer constituting such a boundary.
(noun)
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Mathematics The boundary of a three-dimensional figure.
(noun)
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Mathematics The two-dimensional locus of points located in three-dimensional space.
(noun)
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Mathematics A portion of space having length and breadth but no thickness.
(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.