attenuator
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at·ten·u·a·tor
(ă-ten'yū-ā-tŏr, -tōr),1. An electrical system of resistors and capacitors used to reduce the strength of electrical signals, as in ultrasonography.
2. The terminator sequence in DNA at which attenuation occurs; located between the operator and the gene for the first protein in an operon.
attenuator
[əten′yo̅o̅·ā′tər]
Etymology: L, attenuare, to make thin
an agent that weakens the toxicity of a poisonous substance or the virulence of a microorganism.