extr - film
- extra dynamite
- extra electrode
- extra hole
- extra travel
- extraction drift
- extraction system
- extractor fan
- extraneous current
- extraneous wave
- extrapolated field
- extraterrestrial radiation
- extremal point
- extreme density
- extremely high frequency
- extremely low frequency
- extremum point
- extrinsic semiconduction
- eye link
- eye pit
- eye splice
