spacer
nounUK /ˈspeɪsə/
US /ˈspeɪsər/
A spacer is a thing you put between two objects to keep them apart.
She used a small spacer to keep the shelves from touching.
OTHER MEANINGS
2. A device in an inhaler that helps medicine reach the lungs.
The doctor gave him a spacer to use with his asthma inhaler.
3. A piece of tubing or hardware that keeps parts at a set distance.
He added a metal spacer between the wheel and the frame.
4. A person or thing that creates space or distance between others.
The referee acted as a spacer between the two arguing players.
5. In genetics, a short DNA sequence between two genes.
Scientists studied the spacer region between the two genes.