Medical Dictionary

vacuum vac·u·um (vāk'yōō-əm, -yōōm, -yəm)
n. pl. vac·u·ums or vac·u·a (-yōō-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® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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