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Having three parts; threefold.
[Late Latin trīnālis, from Latin trīnus, trine; see trine.]
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.
threefold; triple; trine.
[1555–65; < Late Latin trīnālis]
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