Relating to or involving suction, the act of pulling something in with a force like sucking.
Suctional things are often used in cleaning, medicine, and science.
Examples:
The suctional machine cleaned up the water.
The doctor used a suctional tool to remove the extra blood.
The suctional force was very strong.
The suctional cup stuck to the wall and wouldn't come off!
The suctional power of the vacuum was so strong, it sucked up everything in its path.
The suctional force of the black hole was very strong.