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molecular cloud

noun
1.
a cool dense interstellar region composed of a wide variety of molecules, mainly hydrogen, plus some dust, in which stars are forming
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Contemporary definitions for molecular cloud
noun

a single-family operated business with few (or no) employees other than the owners

Examples

My grandparents owned a mom-and-pop grocery store when I was growing up.

Word Origin

1951

Usage Note

colloquial

Dictionary.com's 21st Century Lexicon
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