hodoscope

ho do scope |ˈhädəˌskōp ˈhɑdəˌskoʊp | ▶noun Physics an instrument for observing the paths of subatomic particles, esp. those arising from cosmic rays. ORIGIN early 20th cent. (denoting a microscope for examination of light paths in crystals ): from Greek hodos ‘way ’ + -scope. The current sense dates from the 1950s.

hodoscope

hodoscope |ˈhɒdəskəʊp | ▶noun Physics an instrument for observing the paths of subatomic particles, especially those arising from cosmic rays. ORIGIN early 20th cent. (denoting a microscope for examination of light paths in crystals ): from Greek hodos ‘way ’ + -scope .