sludge

Semisolid material such as the type precipitated by sewage treatment.

Mud, mire, or ooze covering the ground or forming a deposit, as on a riverbed.

Finely broken or half-formed ice on a body of water, especially the sea.

An agglutination or aggregation of blood cells forming a semisolid mass that often impedes circulation.

To agglutinate or aggregate into a semisolid mass; form a sludge. Used of blood cells.