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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. A device for observing individual scintillations produced by ionizing radiation, as one consisting of a tube with a magnifying lens at one end and a phosphorescent screen and speck of radioactive salt at the other.

Century Dictionary and Cyclopedia

  1. n. An instrument, invented by Sir William Crookes, exhibiting the fluorescence produced by radium, containing a screen of fluorescent material, usually willemite (zinc silicate), on which a trace of radium is mounted, and a magnifying-glass in front of the screen. In darkness the screen shows a number of scintillating sparks caused by the impact of the radium rays on the willemite.

Wiktionary

  1. n. an early device used for observing individual nuclear disintegrations

GNU Webster's 1913

  1. n. A small instrument containing a minute particle of a radium compound mounted in front of a fluorescent screen and viewed with magnifying lenses. The tiny flashes produced by the continual bombardment of the screen by the α rays are thus rendered visible.

Etymologies

  1. Greek spintharis, spark + -scope. (American Heritage® Dictionary of the English Language, Fourth Edition)

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‘spinthariscope’ has been looked up 668 times, loved by 1 person, added to 5 lists, and has a Scrabble score of 23.