- The C clef positioned to indicate that the fourth line from the bottom of a staff represents the pitch of middle C.次中音谱号：表示从底线向上的第四根线代表中音C的C型谱号
- extraembryonic
- extragalactic
- extrahepatic
- extra-high voltage
- extrajudicial
- extralegal
- extramarital
- extramundane
- extramural
- extramusical
- extraneous
- extranet
- extranets
- extranuclear
- extraocular muscle
- extraordinaire
- extraordinary
- extrapolate
- extrapolated
- extrapolates
- extrapolating
- extrapyramidal
- extras
- extrasensory
- extrasensory perception