de·fer·ves·cence /ˌdi(ˌ)fɚ/
退熱期; 熱退期; 止沸
De·fer·ves·cence De·fer·ves·cency n.
1. A subsiding from a state of ebullition; loss of heat; lukewarmness.
A defervescency in holy actions. --Jer. Taylor.
2. Med. The subsidence of a febrile process; as, the stage of defervescence in pneumonia.
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defervescence
n : abatement of a fever