Definitions
from The Century Dictionary.
- noun The external opening by which water passes to or from the gills; the branchial aperture.
Etymologies
Sorry, no etymologies found.
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Examples
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One such poison-spine was situated on each side of the hinder part of the head in front of the gill-opening.
The Common Frog 1874
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In a North American genus, however (Menopoma), which, though smaller in size, closely resembles Cryptobranchus in figure, there is a permanent gill-opening, though the gills themselves disappear in the adult,
The Common Frog 1874
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* Place where the small opening in the sac has been observed. a, Lateral line and it branches; b, gill-opening; c, central fin; d, base of pectoral fin; e, base of dorsal fin 2, Operculum, with the penorated spine. which, on account of their superficial resemblances to frogs, are termed "Batrachoid."
The Common Frog 1874
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