Etymology
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branchial (adj.)

"of or pertaining to gills," 1774, from Modern Latin branchialis, from Latin branchiae "gills," from Greek brankhia "gills," plural of brankhion "fin." Related: Branchiate.

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Definitions of branchial

branchial (adj.)
of or relating to gills (or to parts of the body derived from embryonic gills);
From wordnet.princeton.edu