Definition of pentagonoid in English:

pentagonoid

adjective

rare
  • Resembling a pentagon, somewhat pentagonal; (Physical Anthropology) denoting a skull having a roughly pentagonal cross-section when viewed from above.

Origin

Late 19th century; earliest use found in Journal of the Linnean Society. From pentagon [noun] + -oid.

Pronunciation

pentagonoid

/pɛnˈtaɡənɔɪd/