substance

substance definition - medical

sub·stance (sŭbˈstəns)

noun
  1. That which has mass and occupies space; matter.
  2. A material of a particular kind or constitution.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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