An arrangement of lenses or mirrors or both that gathers light, permitting direct observation or photographic recording of distant objects, A telescope with its tube completely filled with water. Such an instrument was used by Airy at Greenwich, about 1870, as part of a zenith-sector, in order to settle by observation certain questions relating to the aberration of light, a telescope which has a simple eyepiece so constructed or used as not to reverse the image formed by the object glass, and consequently exhibits objects inverted, which is not a hindrance in astronomical observations, verb _To extend or contract in the manner of a telescope, crush together or collapse, make smaller or shorter, transitive verb_ to shorten or abridge significantly, Recent To cause to come into collision, so as to telescope, intransitive verb_ To cause to slide inward or outward in overlapping sections, as the cylindrical sections of a small hand telescope do, To make more compact or concise; condense, To slide inward or outward in or as if in overlapping cylindrical sections, adjective_ Capable of being extended or compacted, like a telescope, by the sliding of joints or parts one within the other; telescopic