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pneumostome

American  
[noo-muh-stohm, nyoo-] / ˈnu məˌstoʊm, ˈnyu- /

noun

  1. a breathing hole in the mantle of a gastropod.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.