black, decaying, organic bottom deposits in some lakes, rivers, etc. that lack oxygen and are rich in hydrogen sulfide
Origin of sapropelfrom sapro- + Classical Greek p?los, mud, slime
A fine-grained sediment rich in organic matter, formed at the bottom of a body of water.
Origin of sapropelsapro- Greek pēlos mud
From German Sapropel, corresponding to sapro- + Ancient Greek Ï€Î·Î»ÏŒÏ‚ (pÄ“los, “mud, clay").