attenuation

Medical Dictionary

attenuation at·ten·u·a·tion (ə-těn'yōō-ā'shən)
n.

  1. A dilution, thinning, or weakening of a substance, especially a reduction in the virulence of a pathogen through repeated inoculation, growth in a different culture medium, or exposure to heat, light, air or other weakening agents.

  2. The energy loss of an ultrasonic beam as it passes through a material.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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