pentagon

1. A polygon with five sides and five angles.
2. A fort with five bastions.

Pronounced as (IPA)

/ˈpɛn.təˌɡɑn/

Etymology

From Middle French pentagone, from Late Latin pentagōnum, from Ancient Greek πεντάγωνον (pentágōnon), noun use of the neuter of the adjective πεντάγωνος (pentágōnos, “five-angled”), from πέντε (pénte, “five”) + -γωνος (-gōnos, “angled”). Equivalent to penta- + -gon.

Synonyms

pentacle

pentahedron

Pentagon

pentagonum