Definition of pentameroid in English:

pentameroid

adjective

  • Of or relating to the extinct superfamily Pentameroidea or family Pentameridae of articulate brachiopods having roughly pentagonal shells, known from fossils of Ordovician to Devonian age.

noun

  • A pentameroid brachiopod.

Origin

Late 19th century; earliest use found in American Cyclopedia. From scientific Latin Pentamerus + -oid.

Pronunciation

pentameroid

/pɛnˈtamərɔɪd/