gas·​ter | \ ˈga-stər How to pronounce gaster (audio) \

Definition of gaster

: the enlarged part of the abdomen behind the pedicel in hymenopterous insects (such as ants)

Examples of gaster in a Sentence

Recent Examples on the Web

Using a type of fluorescent microscopy, researchers from Pennsylvania State University watched fungal colonization in ants from the gaster, the rear end of the abdomen, to the head—and found no trace of fungal cells in the brain. Jennifer Lu, National Geographic, "How a parasitic fungus turns ants into 'zombies'," 18 Apr. 2019 The winter ants also store their food reserves in their gasters, or rear ends, which gives them a pretty spectacular silhouette. Aimee Levitt, Chicago Reader, "Arts / Books / Science Beneath Chicago lies an entire second city of ants," 6 Sep. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'gaster.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of gaster

circa 1909, in the meaning defined above

History and Etymology for gaster

Greek gastēr

Keep scrolling for more

Learn More about gaster

Statistics for gaster

Last Updated

24 Jun 2019

Look-up Popularity

Time Traveler for gaster

The first known use of gaster was circa 1909

See more words from the same year

More from Merriam-Webster on gaster

Rhyming Dictionary: Words that rhyme with gaster

Comments on gaster

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


something desired as essential

Get Word of the Day daily email!

Test Your Vocabulary

What's that Smell?! Quiz

  • wide eyed dog smelling rose
  • Someone who is hircine smells like a:
Name That Thing

Test your visual vocabulary with our 10-question challenge!


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!