from The American Heritage® Dictionary of the English Language, 4th Edition
- Five: pentamerous.
from Wiktionary, Creative Commons Attribution/Share-Alike License
from the GNU version of the Collaborative International Dictionary of English
- A combining form denoting five
- Denoting the degree of five, either as regards quality, property, or composition; Also used adjectively.
from The Century Dictionary and Cyclopedia
- An element in many words of Greek origin or formation, meaning ‘five.’
Greek, from pente, five; see penkwe in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek πέντε (pente, "five") (Wiktionary)