I. | ̷ ̷ ̷ ̷+ adjective
Etymology: hypo- + branchial
1. : situated below the gills : of or relating to the ventral wall of the pharynx ; specifically : of or relating to the endostyle
2. : of, relating to, or being the segment of a branchial arch between the basibranchial and the ceratobranchial
II. noun
( -s )
: a hypobranchial bone or cartilage