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Definition of Sapropel
1. Noun. Sludge (rich in organic matter) that accumulates at the bottom of lakes or oceans.
Definition of Sapropel
1. Noun. an aquatic sludge-like sediment rich in organic matter formed in stagnant water ¹
¹ Source: wiktionary.com
Definition of Sapropel
1. mud consisting chiefly of decaying organic matter [n -S]