Yes, drain is playable
...and is worth 7 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Drain" Definition
noun
A gradual outflow or loss; consumption or depletion: the drain of young talent by emigration.
A pipe or channel by which liquid is drawn off.
Medicine A device, such as a tube, inserted into the opening of a wound or body cavity to facilitate discharge of fluid or purulent material.
Something that causes a gradual loss: interruptions that are a drain on my patience.
The act or process of draining.
verb-transitive
To cause liquid to go out from; empty: drained the bathtub; drain the pond.
To deplete gradually, especially to the point of complete exhaustion. See Synonyms at deplete.
To draw off (a liquid) by a gradual process: drained water from the sink.
To draw off the surface water of: The Mississippi River drains a vast area.
To drink all the contents of: drained the cup.
verb
To discharge surface or surplus water.
To become emptied or freed of liquid by its flowing or dropping .
To empty by drinking the contents of .
idiom
Down the drain To or into the condition of being wasted or lost: All of our best laid plans are down the drain.
verb-intransitive
To become empty by the drawing off of liquid: watched the tub slowly drain.
To become gradually depleted; dwindle: felt his enthusiasm draining.
To discharge surface or excess water: The Niagara River drains into Lake Ontario. When flooded, the swamp drains northward.
To flow off or out: Gasoline drained slowly from the tilted can.
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