sapropel noun.
['saprǝpɛl] E20.[German, formed as SAPRO- + Greek pēlos mud, earth, clay.]An unconsolidated nitrogen-rich sludge of decomposing aquatic micro-organisms that accumulates in anaerobic environments on the bottoms of lakes and seas.
■ sapro'pelic adjective E20. [TahlilGaran] English Dictionary ▲