To treat or combine with sulphur.
Sulphurise is a scientific word used in chemistry.
Examples:
We need to sulphurise the metal to make it stronger.
The scientist will sulphurise the compound in the lab.
Can you sulphurise this substance for the experiment?
I accidentally sulphurised my shirt in the lab!
The wizard sulphurised the potion to make it magical.
She sulphurised the mixture and it turned yellow.