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cosmic dust

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noun Astronomy.
  1. fine particles of matter in space.
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Origin of cosmic dust

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for cosmic dust

cosmic dust

noun
  1. fine particles of solid matter occurring throughout interstellar space and often collecting into clouds of extremely low densitySee also nebula (def. 1)
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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