noun
- Plural of gaster; the enlarged, posterior section of an ant's or wasp's abdomen.
Usage: entomology; technical
Examples
- The entomologist examined the gasters of the ant specimens under the microscope.
- Worker ants use their gasters to store food and produce defensive chemicals.
- The queen's gaster is noticeably larger than those of the worker bees.
- Researchers identified the species by comparing the shape and color of the gasters.