Definition of physoclistous in US English:

physoclistous

adjective

Ichthyology
  • Of, relating to, or designating a teleost fish in which there is no opening between the swim-bladder and the gut.

Origin

Late 19th century; earliest use found in Edward Cope (1840–1897). From scientific Latin Physoclisti, Physoclysti, former name of a division of teleost fishes + -ous.

Pronunciation

physoclistous

/ˌfʌɪsə(ʊ)ˈklɪstəs/