Spin*thar"i*scope (?), n. [Gr. spinqari`s spark + -scope.]
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. -- Spin*thar`i*scop"ic (#), a.
© Webster 1913