Definition of pleurobranchiate in US English:

pleurobranchiate

adjective

Zoology
rare
  • Having or designating gills attached to the side of the body; (of a crustacean) having pleurobranchs; (of a mollusc) belonging to the former order Pleurobranchiata of marine opisthobranchs.

Origin

Late 19th century; earliest use found in Proceedings Lyceum Natural History New York. From pleuro- + -branchiate. With application to molluscs, compare scientific Latin Pleurobranchiata, former order name, Pleurobranchia, former group name, and French pleurobranche.