Blowhole
A blowhole was part of the anatomy of a number of cetacean species, such as whales or dolphins, comparable to the nostril.

In 1986, when James T. Kirk and Spock visited the Cetacean Institute in Sausalito, California; they observed humpback whales, one of which blew water out of its blowhole on the crowd looking over the aquarium. ()

On the  in 2381, when s Kimolu and Matt rescued the non-responsive Ensign Brad Boimler from drowning in Cetacean Ops, they explained that he wasn't breathing and thought that his blowhole was broken. ()

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Anatomy