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pen-

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  1. variant of pene- before a vowel: penannular.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for pen-

Brythonic for "head;" common in place names in Cornwall and Wales (e.g. Penzance, see also Pendragon).

Online Etymology Dictionary, © 2010 Douglas Harper