We have no meanings for "first gill" in our records yet.
1 From the first gill - cleft is formed the tympanic cavity of the ear.
2 In these nothing is left but a relic of the first gill - cleft .
3 The outlying remainder of the first gill - cleft is the rudiment of the external meatus.
4 Above at the basis a small process grows out of this first gill - arch ; this is the upper-jaw process.
5 Of the four original gill-arches of the mammals the first lies between the primitive mouth and the first gill - cleft .
6 The larval period commences at about the thirty-sixth hour with the perforation of the mouth, first gill - cleft and anus.
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