rare-factional

Medical Dictionary

rarefaction rar·e·fac·tion (râr'ə-fāk'shən)
n.
A decrease in density and pressure in a medium, such as air, caused by the passage of a sound wave.

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