Definition of "blowhole" [blow•hole]

• An opening or one of a pair of openings for breathing, located on the top of the head of cetaceans, such as whales and dolphins. The blowhole is opened by muscles upon surfacing and closed by the pressure of water upon diving. (noun)
• A hole in ice to which aquatic mammals, such as dolphins, come to breathe. (noun)
• A vent to permit the escape of air or other gas. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Since the view of the famous blowhole is not wheelchair accessible, Jo sat in the van at a spot perched dangerously close to a cliff where the ocean beat against rocks thousands of feet below."
• "This blowhole is supposed to be the world’s largest."
• "In quiet weather the blowhole is a deep well; in storm it plays a fountain as the waves drive through the long tunnel below and spout their spray high in air in successive jets."