gunk

Noun
  1. Any thick, viscous matter (synset 114980800)
    is a type of: matter - that which has mass and occupies space
    subtypes: sapropel - sludge (rich in organic matter) that accumulates at the bottom of lakes or oceans
    same as: goo, gook, goop, guck, muck, ooze, slime, sludge

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