Slime (noun)

1. A thick, viscous substance, typically one that is dirty or unpleasant.
2. A soft, wet mud or clay.
3. A soft, wet, and slippery substance, such as that produced by certain animals.

Origin:

Old english slīm "slime, mud, mire", of germanic origin; related to dutch slijm and german schleim.

Examples:

1. The slime on the rocks made it difficult to climb the cliff.
2. The pond was filled with green slime.
3. He cleaned off the slime from his shoes.
4. The snail left a trail of slime behind it.
5. The slime mold was a strange and fascinating organism.