noun
- The enlarged, posterior section of the abdomen in ants, wasps, and related insects.
Usage: entomology; technical
Examples
- The ant's gaster contains the reproductive organs and poison gland.
- Entomologists examine the gaster to identify different wasp species.
- The gaster of the queen bee is noticeably larger than that of worker bees.
- The insect's gaster swelled as it prepared to lay eggs.