gill arch is a noun meaning "one of the bony or cartilaginous arches on each side of the pharynx that support the gills of fishes and aquatic amphibians". It carries one recorded sense.
one of the bony or cartilaginous arches on each side of the pharynx that support the gills of fishes and aquatic amphibians
Definitions, synonyms and semantic relations for gill arch come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.