chron·o·scope 
(krŏnə-skōp′, krōnə-)
(krŏnə-skōp′, krōnə-)n.
An optical instrument for the precise measurement of very small time intervals.
chron′o·scopic (-skŏpĭk) adj.
- electrochemically
- electrochemist
- electrochemistry
- electrochromic
- electrocoagulation
- electroconvulsive therapy
- electrocute
- electrocution
- electrode
- electrodeposit
- electrodeposition
- electrodermal
- electrodialysis
- electrodynamometer
- electroencephalogram
- electroencephalograph
- electroencephalographic
- electroencephalography
- electroform
- electrogenesis
- electrogenic
- electrograph
- electrohydraulic
- electrohydraulically
- electrojet