Definition of opisthocoelian in US English:

opisthocoelian

adjective

Zoology
  • = opisthocoelous. Also in extended use. Now rare.

Origin

Mid 19th century; earliest use found in Richard Owen (1804–1892), comparative anatomist and palaeontologist. From opistho- + ancient Greek κοῖλος hollow + -ian.

Pronunciation

opisthocoelian

/əˌpɪsθəˈsiːlɪən/