MEATUS • DICTIONARY ONE.COM • Definition of Meatus

... of the clitoris, within the folds of the labia, is situated the meatus urinarius, or opening leading to the bladder. This aperture does not open directly into the bladder but is connected to it by a tube, about an inch and a half ...

— Herself - Talks with Women Concerning Themselves • E. B. Lowry

... Selachii this remains throughout life an open squirting-hole, and lies between the first and second gill-arch. In the embryo of the higher Vertebrates it closes up in the centre, and thus forms the tympanic membrane. The outlying remainder of the first gill-cleft is the rudiment of the external meatus. From its inner part we get the tympanic cavity, and, further inward still, the Eustachian tube. Connected with this is the development of the three bones of the mammal ear from the first two gill-arches; the hammer and anvil are formed from the first, the stirrup from the upper ...

— The Evolution of Man, V.2 • Ernst Haeckel