1. blowhole - Noun
2. blowhole - Verb
A cavern in a cliff, at the water level, opening to the air at its farther extremity, so that the waters rush in with each surge and rise in a lofty jet from the extremity.
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.
An air hole in a casting.
Source: Webster's dictionary“The oversized draft tube and collar kept me warm without having to scrunch the blowhole down to an uncomfortable size, even in 25°F temps,” said our tester after a trip in New Mexico’s Carson National Forest. Source: Internet
Whales, of course, are mammals that live in the ocean; that’s why they evolved to have a blowhole in the first place. Source: Internet