American Heritage Dictionary
(5)
Century Dictionary
(11)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
MSN Wonderwall Aggregates Celebrity Slop - Microsoft has dipped its toes in some pretty bizarre tidepools over the years (remember Actimates?) but the latest might more accurately be described as a sludge pool: celebrity gossip.— Megite Technology News: What's Happening Right Now
And to the right, there is the Calumet Water Reclamation Plant, better known as the sludge plant, treating sewage from all around the region.— Pat Dollard | Young Americans
By the time the sludge is a barrel of processed synthetic crude, it has produced 187 pounds of carbon dioxide, three times as much greenhouse gas as a traditional barrel of oil.— Water Conserve: Water Conservation RSS Newsfeed
A recent law discontinued this process, and now the sludge is treated (we hope) and sold as fertilizer.— English-writing Israeli-bloggers

American Heritage Dictionary (1)
Century Dictionary (1)
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