vacuum

vacuum definition - medical

vac·u·um (văkˈyo͞o-əm, -yo͞om, -yəm)

noun pl. vac·u·ums or vac·u·a (-yo͞o-ə)
  1. Absence of matter.
  2. A space empty of matter.
  3. A space relatively empty of matter.
  4. A space in which the pressure is significantly lower than atmospheric pressure.

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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