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The Collaborative International Dictionary of English v.0.48 (gcide)

Branchial \Bran"chi*al\, a. (Anat.)
Of or pertaining to branchi[ae] or gills.
[1913 Webster]

{Branchial arches}, the bony or cartilaginous arches which
support the gills on each side of the throat of fishes and
amphibians. See Illustration in Appendix.

{Branchial clefts}, the openings between the branchial arches
through which water passes.
[1913 Webster]