Relating to a stoma, which is a small opening in a plant or animal's body.
The word 'stomal' is used in science to talk about small openings in living things.
Examples:
The stomal opening allows the plant to breathe.
The stomal hole is very small.
The stomal part of the leaf helps the plant get air.
The stomal thing is very important for the plant.
The stomal opening is like a tiny window for the plant.
The stomal part of the body is very interesting to scientists.