American Heritage Dictionary
(2)
Century Dictionary
GNU Webster's 1913
WordNet
(3)
Elsewhere on the web
The technical powerhouse, which is spending $90m to acquire four buildings, downplayed reports of the purchases— The Harvard Crimson :: News
One nice thing about her being a "powerhouse" -- it means Joe Biden can take off the gloves for the VP debate.— The Seventh Sense
Once the expansion is complete, the powerhouse will be able to produce up to 1,200 kilowatts of power per hour.— QCOnline Metro News
Be careful about portraying a corpulent clown as a powerhouse, as some Limbaugh stories do, lest you turn him into one.— Original Signal - Transmitting Buzz
Not only is Maine known as a powerhouse of strong hitters who make a living swinging for the fences, many of them are lefties - a strategic nightmare considering Penn's dearth of southpaws.— The Daily Pennsylvanian

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