Why be so critical of terms?....technically, you can't measure damping on one hand or the "other"

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dead·en·ing Audio Help /ˈdɛdnɪŋ/ Pronunciation Key - Show Spelled Pronunciation[ded-n-ing] Pronunciation Key - Show IPA Pronunciation
–noun
1. a device or material employed to deaden or render dull.
2. a device or material preventing the transmission of sound.
3. a woodland in which the trees are killed by girdling prior to being cleared.


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damp·ing /ˈdæmpɪŋ/ Pronunciation Key - Show Spelled Pronunciation[dam-ping] Pronunciation Key - Show IPA Pronunciation
–noun Physics.
1. a decreasing of the amplitude of an electrical or mechanical wave.
2. an energy-absorbing mechanism or resistance circuit causing this decrease.
3. a reduction in the amplitude of an oscillation or vibration as a result of energy being dissipated as heat.


Both are actual terms, the O/P asked specifically about "deadener"

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