a combining form occurring in loanwords from Greek, meaning “five” (Pentateuch ); on this model, used in the formation of compound words (pentavalent ).
Also, especially before a vowel, pent-.

< Greek pent-, penta-, comb. forms representing pénte five Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
combining form
five: pentagon; pentameter; pentaprism
[from Greek pente five]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

comb. form meaning "five," from Gk. penta- (before a vowel, pent-), from pente "five," related to Aeolian pempte (see five).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

penta- or pent-

  1. Five: pentameter.

  2. Containing five atoms, molecules, or groups: pentose.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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