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noun blow·hole \-ˌhōl\

Simple Definition of blowhole

  • : a hole that is on the top of a whale or related animal's head and is used by the animal for breathing

  • : a hole in the ice to which seals and other animals that are living in the water under the ice come to breathe

Source: Merriam-Webster's Learner's Dictionary

Full Definition of blowhole

  1. 1 :  a hole in metal caused by a bubble of gas captured during solidification

  2. 2 :  a nostril in the top of the head of a cetacean and especially a whale

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