iron oxide

noun Chemistry. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
iron oxide  
Any of various oxides of iron, such as ferric oxide or ferrous oxide.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It measures the magnetic properties of tiny particles of iron oxide that are
  injected into the bloodstream.
They are made from tiny blobs of polymer that contain particles of iron oxide.
It precipitates out as iron oxide and can then be recovered and recycled,
  leaving water pure enough to discharge into a river.
The three things were calcium carbonate which is sedimentary rock, iron oxide
  which is a component of igneous rock, and water.
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