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A dolmen, especially one found in Ireland.
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.
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|Noun||1.||portal tomb - a prehistoric megalithic tomb typically having two large upright stones and a capstone|
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