Relating to or involving the process of secreting substances, especially by glands in the body.
The word 'secretionary' is related to the body and how it makes and releases things. It's a scientific word.
Examples:
The doctor studied the secretionary process in the body.
The secretionary glands are important for our health.
She learned about the secretionary system in science class.
The secretionary stuff in our bodies is like a factory!
The secretionary work of our bodies is like a big secret factory inside us.
The teacher made a fun song about the secretionary system.