from The Century Dictionary.
- noun A drip-pipe; a pipe for draining the water from the cylinder of an engine or a pump.
Sorry, no etymologies found.
At our end of the room were the two large trays that I had seen in the workshop, now mounted on trestles and each fitted with a rubber drain-tube leading down to a bucket.
Polton, who had been waiting with his hand on the stop-cock of the drain-tube, rapidly ran off the developer into the bucket and flooded the paper with the fixing solution.
As the water rises, it takes the path of least resistance into the drain-tube (also known as drain tile).