Definition of gill arch in English:

gill arch

Syllabification: gill arch

noun

  • 1Any of a series of bony or cartilaginous curved bars along the pharynx, supporting the gills of fish and amphibians.
    More example sentences
    • Originally, it may have been the main upper element of a gill arch.
    • Inside the fleshy gill arches, used for breathing, lies a system of bony gill arches, which form a finely divided sieve.
    • It is not extant, but it had gill arches, fins, and several other characters indicative of an aquatic lifestyle.
  • 1.1Any of the corresponding rudimentary structures in the embryos of higher vertebrates.
    More example sentences
    • They differ from the earlier vertebrates in that some of the gill arches undergo modification in early development to become the jaw and its supporting structures.
    • This embryonic origin of the gill arches has been thought to be a good argument for their involvement with the jaw, but against their relationship with the limbs.
    • Primitively, then, there was a one-to-one correspondence between aortic arches and gill arches.

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Word of the day coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody