from The Century Dictionary and Cyclopedia
- n. One of several diverticula of the paunch of the camel, serving to store up water. See water-bag, 1.
- n. A voltaic cell in which the liquid is pure water.
Sorry, no etymologies found.
Presently, however, if you are watching a piece of this living leaf in a flat water-cell under the microscope, you will see the slit slowly open, and begin to turn as it were inside out, exactly like the finger of a glove, which has been pushed in at the tip, gradually rises up when you put your finger inside it.