Science Dictionary
grain   (grān)  Pronunciation Key 
  1. See caryopsis.

  2. A small particle of something, such as salt, pollen, or sand.

  3. A unit of weight in the US Customary System, equal to 2/1000 of an ounce (0.07 gram). See Table at measurement.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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