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One of two offspring born at the same birth.
(noun)
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One of two identical or similar people, animals, or things; a counterpart.
(noun)
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Mineralogy Two interwoven crystals that are mirror images of each other.
(noun)
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A twin-size bed.
(noun)
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Being two or one of two offspring born at the same birth: twin sisters.
(adjective)
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.