pentagon

Meaning

Noun

• A polygon with five sides and five angles.
• A fort with five bastions.

Origin

• From Middle French pentagone, from Late Latin pentagōnum, from Ancient Greek πεντάγωνον, noun use of the neuter of the adjective πεντάγωνος, from πέντε + -γωνος. Equivalent to penta- + -gon.