gill arch

[gil]

noun

Origin of gill arch

First recorded in 1875–80

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Note the gill-rakers, short and blunt, on the first gill-arch.
Elementary Zoology, Second Edition
Vernon L. Kellogg
Von Baer also confirmed Rathke's discovery of the operculum, assigning it, however, to the second gill-arch.
Form and Function
E. S. (Edward Stuart) Russell
Huschke was indeed the first to suggest that both upper and lower jaws were formed in the first gill-arch.
Form and Function
E. S. (Edward Stuart) Russell
On the three bones forming the first gill-arch are attached numerous appendages called gill-rakers .
A Guide to the Study of Fishes, Volume 1 (of 2)
David Starr Jordan

gill arch in Medicine

(gĭl)