Word:

Opisthobranchia

O`pis`tho`bran´chi`a
n. pl.1.(Zool.) A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs.
Noun1.Opisthobranchia - gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares
class, class Gasteropoda, class Gastropoda, Gasteropoda, Gastropoda, Nudibranchia, order Nudibranchia, subclass Opisthobranchia
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Opinicus
Opining
Opinion
opinion poll
Opinionable
Opinionate
Opinionated
Opinionately
Opinionatist
Opinionative
Opinionator
Opinioned
Opinionist
Opiparous
Opisometer
Opisthion
-- Opisthobranchia --
Opisthobranchiate
Opisthocoelian
Opisthocomidae
Opisthocomus
Opisthocomus hoazin
Opisthodome
Opisthoglypha
Opisthognathidae
opisthognathous
Opisthography
Opisthomi
Opisthopulmonate
opisthorchiasis
Opisthotic
Opisthotonos
Opitulation
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