pro·​sto·​mi·​um | \ prō-ˈstō-mē-əm How to pronounce prostomium (audio) \
plural prostomia\ prō-​ˈstō-​mē-​ə How to pronounce prostomia (audio) \

Definition of prostomium

: the portion of the head of an annelid worm (such as an earthworm) that is situated in front of the mouth

Other Words from prostomium

prostomial \ prō-​ˈstō-​mē-​əl How to pronounce prostomial (audio) \ adjective

First Known Use of prostomium

1870, in the meaning defined above

History and Etymology for prostomium

New Latin, from Greek pro- + stoma mouth — more at stomach entry 1

Keep scrolling for more

Learn More about prostomium

Statistics for prostomium

Last Updated

17 Sep 2019

Look-up Popularity

Time Traveler for prostomium

The first known use of prostomium was in 1870

See more words from the same year

More from Merriam-Webster on prostomium

Rhyming Dictionary: Words that rhyme with prostomium Encyclopedia article about prostomium

Comments on prostomium

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


miscellaneous remnants or debris

Get Word of the Day daily email!

Test Your Vocabulary

The Exceptions Quiz III

  • one green toy robot amidst many red toy robots
  • Which of these words does not mean "nonsense"?
True or False

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

Add Diction

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

Love words? Need even more definitions?

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