cassegrainian telescope(n = noun.artifact) gregorian telescope - a reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror; light is brought to a focus through an aperture in the center of the primary mirror;
is a kind of reflecting telescope, reflector

astronomical telescope, coude telescope, galilean telescope, gregorian telescope, herschelian telescope, hubble space telescope, hubble telescope, maksutov telescope, newtonian telescope, optical telescope, radio telescope, reflecting telescope, refracting telescope, schmidt telescope, solar telescope, telescope, telescope bag, telescope sight, water telescope