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单词 attenuation
释义

WordReference Random House Unabridged Dictionary of American English © 2024
at•ten•u•a•tion  (ə ten′yo̅o̅ ā′shən),USA pronunciation n. 
  1. the act of attenuating or the state of being attenuated.
  2. Microbiologythe process by which a virus, bacterium, etc., changes under laboratory conditions to become harmless or less virulent.
  3. Physicsa 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.
  • Latin attenuātiōn- (stem of attenuātiō). See attenuate, -ion
  • Middle French)
  • (1585–95

Collins Concise English Dictionary © HarperCollins Publishers::
atˌtenuˈation /əˌtɛnjʊˈeɪʃən/ n
  1. the act of attenuating or the state of being attenuated
  2. the loss of energy suffered by radiation as it passes through matter, esp as a result of absorption or scattering
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