The word "defervescent" is an adjective that describes something related to the reduction of a fever. When someone has a fever, their body temperature is higher than normal, often due to illness. When the fever starts to go down and the temperature returns to normal, we can say that the person is becoming "defervescent."
"Defervescent" is a useful term in medical contexts when talking about the decrease of fever. It’s important to use it in appropriate settings, such as discussions about health, illness, or medical treatment.