any free-floating freshwater alga that forms a green scum on water.
How are “scum,” “sludge,” “slush,” “slime,” “ooze,” “muck,” “mire,” “goo” and “gunk” different?Toxic red sludge poured into a Hungarian village this week after a dam containing the chemical residue from an aluminum plant burst. At least four people were killed and dozens injured. The sludge continues to flow and threatens to contaminate the Danube River, one of Europe’s major waterways. This tragedy poses a linguistic puzzle that, hopefully, can help us better describe the type of environmental horrors that seem to …
Talk Like a Sailor: 9 Fascinating Nautical TermsRead more in this article about some frequently asked questions and fun facts related to our definitions.
- pond hockey,
- pond life,
- pond lily,
- pond snail,
Origin of pond scum
First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a greenish layer floating on the surface of stagnant waters, consisting of various freshwater algae
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012