Sapropels'

sapropel

[sap-ruh-pel]
noun
mud consisting chiefly of decomposed organic matter formed at the bottom of a stagnant sea or lake.

Origin:
1905–10; sapro- + -pel < Greek pēlós mud

sapropelic, adjective
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Collins
World English Dictionary
sapropel (ˈsæprəˌpɛl)
 
n
an unconsolidated sludge consisting of the decomposed remains of aquatic organisms, esp algae, that accumulates at the bottoms of lakes and oceans
 
[C20: from sapro- + -pel from Greek pēlos mud]
 
sapro'pelic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
sapropel   (sāp'rə-pěl')  Pronunciation Key 
An unconsolidated ooze consisting mainly of putrefied plant remains and found in anaerobic areas at the bottom of swamps, lakes, and shallow seas.
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