aerator
nounUK /ˈeə.reɪ.tər/
US /ˈer.eɪ.tɚ/
A machine that puts air into water or soil.
The gardener used an aerator to put air into the lawn.
OTHER MEANINGS
2. A device on a faucet that mixes air with water to make the flow softer.
The new faucet aerator made the water flow gently.
3. A machine that pushes air into a tank of water so fish can breathe.
The aquarium aerator keeps the fish healthy.
4. A tool that makes small holes in the ground so air and water can reach plant roots.
He pushed the lawn aerator across the grass.