OPISTHOBRANCH
Etymology
Noun
opisthobranch (plural opisthobranches)
(zoology) A gastropod with gills behind the heart, formerly thought to belong to a single group.
Adjective
opisthobranch (not comparable)
(of gills) Placed behind the heart.
Antonym: prosobranch
(of a gastropod) Having gills placed behind the heart.
Antonym: prosobranch
Source: Wiktionary
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RIGHT
(noun) anything in accord with principles of justice; “he feels he is in the right”; “the rightfulness of his claim”
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