Definitions

1. noun

A characteristic of certain marine animals, such as sea hares and octopuses, in which the gill slits are on the sides of the head, rather than on the underside.

“The new species of sea hare was notable for its dibranchia, a rare trait in its family.”

2. adjective

Having or relating to a dibranchiate body structure.

“The marine biologist studied the dibranchia morphology of several species in the ocean.”