Noun
molybdenum disulfide (uncountable)
(chemistry) a black, crystalline inorganic polymer of empirical formula MoS2 that occurs as the mineral molybdenite and is used as a lubricant having a structure analogous to graphite
The Elements. pp. 105–107 Compounds (14% of global use) * Molybdenum disulfide (MoS 2 ) is used as a solid lubricant and a high-pressure high-temperature (HPHT) antiwear agent. Source: Internet