blowhole

== English == === Etymology === From blow +‎ hole. === Pronunciation === IPA(key): /ˈbləʊhəʊl/ === Noun === blowhole (plural blowholes) (marine biology) The spiracle, on the top of the head, through which cetaceans breathe. (marine biology) A hole in sea ice where cetaceans and pinnipeds come to breathe. (geology) A top-facing opening to a cavity in the ground very near an ocean's shore, leading to a marine cave from which wave water or bursts of air are expelled. (geology) A vent for the escape of steam or other gas. (metallurgy) An unintended cavity filled with air in a casting product. (computer hardware) A vertical opening in the top of a computer case that lets hot air (primarily from the CPU heat sink) escape quickly. ==== Translations ==== === Verb === blowhole (third-person singular simple present blowholes, present participle blowholing, simple past and past participle blowholed) (metallurgy, ambitransitive) To fill or be filled with air in an unintended cavity.