Initialism: estimated time of departure (transport).

Initialism: electron-transfer dissociation (mass spectrometry).

Initialism: Everhart–Thornley detector (scanning electron microscopy).

Initialism: explosives trace detector (security screening).

Initialism: eye tracking device.

Initialism: emergency travel document.

Initialism: exchange-traded derivative (finance).

Initialism: Eustachian tube dysfunction (medicine).