1. (a.) Of or pertaining to a telescope; performed by a telescope.

2. (a.) Seen or discoverable only by a telescope; as, telescopic stars.

3. (a.) Able to discern objects at a distance; farseeing; far-reaching; as, a telescopic eye; telescopic vision.

4. (a.) Having the power of extension by joints sliding one within another, like the tube of a small telescope or a spyglass; especially (Mach.), constructed of concentric tubes, either stationary, as in the telescopic boiler, or movable, as in the telescopic chimney of a war vessel, which may be put out of sight by being lowered endwise.