'aethrioscope' originates from Greek, specifically the word 'aithrios,' where 'aithrios' meant 'clear' or 'serene.'

'aithrios' transformed into the Latin word 'aether,' and eventually became the modern English word 'aethrioscope' through scientific terminology.

Initially, it meant 'an instrument for measuring clear sky conditions,' but over time it evolved into its current meaning of 'an instrument used to measure the temperature of the sky or the atmosphere.'