'temperature-fluctuating' originates from the combination of 'temperature' and 'fluctuating', where 'temperature' refers to the degree of heat present in a substance or object, and 'fluctuating' means varying or changing.

The term 'temperature-fluctuating' combines the words 'temperature' from Latin 'temperatura' and 'fluctuating' from Latin 'fluctuare', meaning to move in waves.

Initially, it meant 'changing in temperature', and this meaning has largely remained the same in modern usage.