gill arch

[gil]

Origin:
1875–80

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American Heritage
Medical Dictionary

gill arch n.
See branchial arch.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

gill arch

one of the bony or cartilaginous curved bars on either side of the pharynx (throat) that support the gills of fishes and amphibians; also, a corresponding rudimentary ridge in the embryo of higher vertebrates, which in some species may form real but transitory gill slits. In the human embryo, the branchial arches give rise to such structures as the mandible, hyoid bone, and larynx.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
There it is chewed, so to speak, by teeth on the modified lower branches of the
  last gill arch.
If the fish is small, remove the entire gill arch and transfer to a slide.
The number of gill rakers on the upper and lower limbs of the first left gill
  arch were also recorded for each fish.
Wet mounts of gill filaments are made by using a small pair of surgical
  scissors to remove a portion of one gill arch.
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