Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

pneumostome

noun
pneu·​mo·​stome | \ ˈn(y)üməˌstōm\
plural -s

Definition of pneumostome 

: the respiratory opening of a gastropod mollusk

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

History and Etymology for pneumostome

International Scientific Vocabulary pneum- + -stome

Keep scrolling for more

Learn More about pneumostome

Share pneumostome

Statistics for pneumostome

Look-up Popularity

Comments on pneumostome

What made you want to look up pneumostome? Please tell us where you read or heard it (including the quote, if possible).

Show Comments  Hide Comments 

WORD OF THE DAY

liaison

a person who helps groups work together

Get Word of the Day daily email!

Test Your Vocabulary

Liar, Liar Quiz

  • alt-5761dbe2ba986
  • Someone who pretends to be sick in order to avoid work is a:
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words at Play

Ask the Editors

Word Games