A nostril or spiracle in the top of the head of a whale or other cetacean.
A hole in the ice to which whales, seals, etc., come to breathe.
A whale or dolphin's 'nostril' on the top of their head. Baleen whales have two, toothed whales and dolphins only one.
opening to the lungs of a whale, similar to human nostrils.
An air hole in a casting.
irregularly shaped cavities with smooth walls produced in a casting when gas, evolved during solidification of the metal, fails to escape and is held in pockets.
a hole for the escape of gas or air
a hole to help them breath
a spout of water which shoots out of a natural chimney in the rock as the ocean waves hit the rocks
aperture in the roof of a sea cave through which waves force compressed air and spray
In geology, a blowhole is a cavity formed in the ground at the inland end of a sea cave. When waves enter the mouth of the cave they will be funneled up towards the blowhole, which can result in quite spectacular splashes if the geometry and state of the weather is appropriate.