Definition of pentremite in US English:

pentremite

noun

  • A fossil blastoid echinoderm of the mostly North American genus Pentremites, having five spiracles surrounding the mouth.

Origin

Mid 19th century; earliest use found in Transactions of the Geological Society. From scientific Latin Pentremites, former genus name from penta- + ancient Greek τρῆμα hole, aperture + scientific Latin -ites, with omission of the second syllable, -ta-.

Pronunciation

pentremite

/ˈpɛntrəmʌɪt/