Graphite is a slippery, black substance used as a lubricant and for making pencil lead, among other things.

It was extremely orange, and made of some slippery substance almost certainly not found in nature.

Is there any way I can get rid of this slippery substance?

At the moment, my grip on that slippery substance seemed remarkably feeble.

This discovery caused him to begin looking for a slippery substance that could be used for the socket of a total hip replacement operation.

Unlike scuffing, when a pitcher uses a slippery substance on a ball, he should always put it in the same place.

It is illegal for any player to put adhesive or slippery substances such as the product "stickum" on his body, equipment or uniform.

Because the baby's lungs lack a slippery substance (surfactant), the tiny air sacs are not able to expand as easily.

This slippery substance lubricates the joints, protects delicate tissues in the eyes and helps the skin stretch and bend.