low-den·si·ty

[loh-den-si-tee]
adjective
having a low concentration.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
low-density

adjective
1. having low relative density or specific gravity 
2. having low concentration; "low-density urban areas" 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Low-density is always a great word to know.
So is bezoar. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Example sentences
From wings to low-density bones to echolocation, the evolution of flight in
  bats required many radical changes.
Rather, he said, the money is being disproportionately spent on low-density
  areas that also happen to have low unemployment rates.
The asteroid appears to be a low-density collection barely held together by its
  own low gravity.
The false-color image of the prominence above is actually taken in the
  ultraviolet, where low-density helium glows.
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