scintilloscope
noun
scin·til·lo·scope
variants or less commonly scintilliscope
sin‧ˈtiləˌskōp
: a small instrument similar to the spinthariscope for exhibiting scintillations (as of a radioactive substance) on a sensitive screen
Word History
Etymology
scintillo-, scintilli- (from Latin scintilla) + -scope
First Known Use
1904, in the meaning defined above