WordReference Random House Unabridged Dictionary of American English © 2025
al•le•vi•a•tor
(ə lē′vē ā′tər),USA pronunciation n.
- a person or thing that alleviates.
- Mechanical Engineering(in a pipeline) an airtight box, having a free liquid surface, for cushioning the shock of water hammer.
- alleviate + -or2 1805–15