[waw-ter-bed, wot-er-] 
| a bed having a liquid-filled rubber or plastic mattress in a rigid, often heated, waterproof frame, and providing a surface that conforms to the sleeper's body in any position. |
| wa·ter·bed (wô'tər-běd', wŏt'ər-) n. A bed with a mattress made of a tough plastic that is filled with water. |
tərˌbɛd