Camelback

noun

1. The backs of camels.

   "We travelled across the desert on camelback."

2. A flexible water container worn on the back.

   "An empty camelback is a blessing and a curse: it is easy to carry, but it means you have no water."

3. A house with a second storey that does not completely cover the ground floor.

   "My friend lived in a camelback; we used to have fun climbing out of the window onto the roof below."

4. A railway locomotive that has its cab in the middle as opposed to at the end.

   "The camelbacks were designed to help with the visibility problems inherent in putting the driver behind the entire engine."

5. A camelback sofa or chair.

   "He fell back relieved into his favourite camelback with a gin and tonic."