WordReference Random House Unabridged Dictionary of American English © 2026
sap•ro•pel
(sap′rə pel′),USA pronunciation n.
sap′ro•pel′ic, adj.
- Geologymud consisting chiefly of decomposed organic matter formed at the bottom of a stagnant sea or lake.
- Greek pēlós mud
- sapro- + -pel 1905–10