Lubricant definitions

lo͝o'brĭ-kənt
A substance for reducing friction in this way, as oil or grease.
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A substance used to reduce friction between objects or surfaces.
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A substance, such as grease or oil, that reduces friction when applied as a surface coating to moving parts.
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A slippery liquid, gel, or oil that is used to reduce friction on or soreness of body tissue.
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One that facilitates conversation or cooperation.

Saw coffee as a social lubricant.

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Reducing friction by providing a smooth film as a covering over parts that move against each other; lubricating.
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