pentad Hear it!

pentad definition

pen·tad (pen′tad′)

noun

  1. the number five
  2. a series or group of five
  3. a five-year period
  4. Chem. a pentavalent element or radical

Etymology: Gr pentas (gen. pentados) < pente, five

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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