Yes, drain is a Scrabble word!

Verb

1. Flow off gradually

2. Deplete of resources

3. Empty of liquid; drain the liquid from

4. Make weak

Noun

1. Emptying something accomplished by allowing liquid to run out of it

2. Tube inserted into a body cavity (as during surgery) to remove unwanted material

3. A pipe through which liquid is carried away

4. A gradual depletion of energy or resources