| 单词 | attenuation |
| 释义 | attenuation /euh ten'yooh ay"sheuhn/, n. 1. the act of attenuating or the state of being attenuated. 2. the process by which a virus, bacterium, etc., changes under laboratory conditions to become harmless or less virulent. 3. 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. [1585-95; ( < MF) < L attenuation- (s. of attenuatio). See ATTENUATE, -ION] |
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