Depressant (noun)

1. A drug or substance that reduces excitement or stimulation in the central nervous system, resulting in a decrease in activity or a calming effect.
2. A substance that slows down the activity of the central nervous system, resulting in decreased brain and bodily functions.

Origin:

From the latin word depressus, meaning "pressed down" or "depressed".

Examples:

1. Alcohol is considered to be a depressant drug that slows down the nervous system.
2. The depressant effects of the medication made him feel drowsy and lethargic.
3. Depressants are drugs that slow down the activity of the brain and body.
4. Barbiturates are a type of depressant that can be used to treat anxiety and insomnia.
5. Depressants can have a calming effect on the body but can also result in addiction and overdose when used excessively.