A pipe or channel that carries away waste water or other liquids. The kitchen sink was clogged, so we had to call a plumber to fix the drain.
A gradual depletion or reduction of resources, energy, or vitality. The constant demands of the job were a drain on her energy.
A device or fixture that allows liquid to flow out of a container or area. He pulled the plug to let the water out of the bathtub drain.
The act or process of draining; an outflow or gradual emission of liquid. The drain of water from the tank took several minutes.
Medicine: a tube or other device inserted in a wound or body cavity for the removal of fluid. The surgeon inserted a drain to prevent the accumulation of blood.