noun

• Initialism of Electron-transfer dissociation.
• Initialism of estimated time of departure.
• Initialism of Everhart-Thornley detector. [A secondary electron and back-scattered electron detector used in scanning electron microscopes.]
• Initialism of Explosives trace detector.
• Initialism of Eye Tracking Device.
• (UK) Initialism of emergency travel document.
• (finance) Initialism of exchange-traded derivative.
• (medicine) Initialism of Eustachian tube dysfunction. [(medicine) A disorder in which pressure abnormalities in the middle ear result in symptoms.]