Initialism of electroconvulsive therapy.

Misspelling of etc.

(railways, transport) Initialism of European Train Control System (a signalling, control and train protection system, especially for high-speed lines.)

(mechanical engineering) Initialism of engine coolant temperature sensor. / (psychometry) Initialism of elementary cognitive task(s).

outside / ghost related

(geology) Of a geologic period within the Mesoproterozoic era from about 1400 to 1200 million years ago.

(geology) The Ectasian period.

(parapsychology) A visible substance believed to emanate from the body of a spiritualistic medium during communication with the dead.

(medicine) dilatation: for example, bronchiectasis, which refers to a pathologic dilatation of the bronchi of the lung. / (phonology) The lengthening of a syllable from short to long.

A one-stringed musical instrument from India.