penta-


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Related to penta-: octo-, hexa-, HEPT, Icosa

penta-

(word root) five
Examples of words with the root penta-: pentagram
Abused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embree

penta-

or pent-
pref.
Five: pentamerous.

[Greek, from pente, five; see penkwe in Indo-European roots.]
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.

penta-

combining form
five: pentagon; pentameter; pentaprism.
[from Greek pente five]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

penta-

a combining form meaning “five”: pentavalent. Also, esp. before a vowel,pent-.
[< Greek pent-, penta-, comb. forms representing pénte five]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Studies in rats and mice have found that penta- and octa-BDEs disrupt development.
These compounds, being large and bulky, cross the cell membrane with difficulty, rendering them less toxic than their penta- and octa-brominated counterparts.
Moisture contents of penta- and copper naphthenate-treated pole sections became more uniform over the 3-month outdoor exposure, but the untreated poles remained wet (Fig.