| 单词 | attenuation |
| 释义 | attenuation[ uh-ten-yoo-ey-shuhn ] / əˌtɛn yuˈeɪ ʃən / SEE SYNONYMS FOR attenuation ON THESAURUS.COM nounthe act of attenuating or the state of being attenuated. the process by which a virus, bacterium, etc., changes under laboratory conditions to become harmless or less virulent. Physics. a decrease in a property, as energy, per unit area of a wave or a beam of particles, occurring as the distance from the source increases as a result of absorption, scattering, spreading in three dimensions, etc. Origin of attenuation1585–95; (<Middle French ) <Latin attenuātiōn- (stem of attenuātiō). See attenuate, -ion OTHER WORDS FROM attenuationsub·at·ten·u·a·tion, nounWords nearby attenuationattentive, attentively, attenuant, attenuate, attenuated virus, attenuation, attenuator, attercop, attest, attestation, attested Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for attenuationBritish Dictionary definitions for attenuationattenuation / (əˌtɛnjʊˈeɪʃən) / nounthe act of attenuating or the state of being attenuated the loss of energy suffered by radiation as it passes through matter, esp as a result of absorption or scattering Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Medical definitions for attenuationattenuation [ ə-tĕn′yōō-ā′shən ] n.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. 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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