Noun
(countable, uncountable) Rock from the surface of the moon, but especially any geological specimen brought back by the Apollo program.
(slang, uncountable) A mixture of crack cocaine and heroin.
Source: en.wiktionary.orgThe race to the moon was never really about the moon - its utility didn't rest in samples of moon rock. It was about capitalism versus communism, right versus left. David Orrell
Christie, a firm that offers premier auctions and private sales of the finest art, antiques and interiors, and more, has put a piece of Moon rock on sale on Thursday. Source: Internet