What was the telescope commonly known as in the Italian vernacular during Galileo's time?

Answer

occhiale or perspicillum

The instrument was known by its function rather than a unique proper name, referred to as the *occhiale* or the *perspicillum* in Italian.

What was the telescope commonly known as in the Italian vernacular during Galileo's time?
nameGalileo Galileiastronomytelescopeinstrument