English
Pentagonese
From Pentagon + -ese.
Formed from Pentagon + -ese
Proto-Indo-European *pénkʷe ‘five’
…
Ancient Greek πεντάγωνος ‘five-angled’
Ancient Greek πεντάγωνον
Late Latin pentagōnum ‘pentaphyllon, cinquefoil’
Middle French pentagone
English Pentagon
Today it means
noun The jargon used by the United States Department of Defense.
Language periods are conventional ranges, not dates for this word.
Etymograph / Pentagonese