Definitions

1. noun

A structure at the mouth of a flower, especially in the Compositae, having a band of hairs or scales that helps to spread pollen.

“The peristome of the sunflower is an adaptation to increase its chances of reproduction.”

2. noun

A ring of muscle fibers surrounding the mouth of a worm, especially a flatworm, involved in the act of swallowing.

“The peristome of the planarian helps it to ingest food and absorb nutrients.”