1.Definition: a gradual depletion of energy or resources

"A drain on resources", "A drain of young talent by emigration"

Category: General

2.Definition: a pipe through which liquid is carried away

Related Noun(s):drainpipe

Category: Objects

3.Definition: emptying something accomplished by allowing liquid to run out of it

Related Noun(s):drainage

Category: General

4.Definition: tube inserted into a body cavity (as during surgery) to remove unwanted material

Category: Objects