(astronomy) An instrument that detects X-rays originating from outside the Earth's atmosphere.

plural of liquid mirror telescope

plural of X-ray telescope

(astronomy) a star that is fainter than 7th magnitude in apparent magnitude, and therefore in most cases is not visible to the naked eye.

plural of telescopic sight

plural of telescopic star

A device used e.g. on a rifle in aiming a projectile, through which the person aiming looks at the intended target.

(figuratively) With the opposite of what is the correct conclusion.

Any of several deep-sea aulopiform fish, of the family Giganturidae, having tubular eyes.

plural of telescopefish