Where does “reflecting telescope” come from?

reflecting telescope (English) comes from English telescope, from Latin telescopium, from Italian telescopio, from Ancient Greek τηλεσκόπος, from Ancient Greek τῆλε, from Latin commūnicāre, from Latin commūnis, from Old Latin com(m)oinis — resin, gum; to say, speak.

reflecting telescope (English): A telescope which produces a magnified image by reflecting light through a series of mirrors housed in a tube, using a large curved mirror to gather the light and one or more additional mirrors to transmit the light to an eyepiece