Definition of gill arch in English:

gill arch

Syllabification: gill arch

Entry from US English dictionary

noun

1Any of a series of bony or cartilaginous curved bars along the pharynx, supporting the gills of fish and amphibians.
1.1Any of the corresponding rudimentary structures in the embryos of higher vertebrates.

Definition of gill arch in:

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Pronunciation: ˌ(h)yo͞oməˈresk
noun
a short, lively piece of music