pentahedral
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pen·ta·he·dron
(pĕn′tə-hē′drən)n. pl. pen·ta·he·drons or pen·ta·he·dra (-drə)
A solid having five plane faces.
pen′ta·he′dral (-drəl) adj.
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.