| NOUN | substance | sapropel | sludge (rich in organic matter) that accumulates at the bottom of lakes or oceans |
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| Meaning | sludge (rich in organic matter) that accumulates at the bottom of lakes or oceans. | |
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| Broader | sludge, slime, goo, goop, gook, guck, gunk, muck, ooze | Any thick, viscous matter |
| Spanish | sapropel | |
| Catalan | sapropel | |
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