__ Jelly, Gelatinous Substance Used as a Lubricant
Puzzle 4 of Yoga Hard Pack
Question is: __ Jelly, Gelatinous Substance Used as a Lubricant
and the answer is: PETROLEUM
Word Meaning:
PETROLEUM — A flammable liquid ranging in color from clear to very dark brown and black, consisting mainly of hydrocarbons, occurring naturally in deposits under the Earth's surface.
Definitions from Wiktionary.