-tron, -tronic, -tronics +

(Greek: a suffix referring to a device, tool, or instrument; more generally, used in the names of any kind of chamber or apparatus used in experiments)

A possible allusion to the Greek instrumental suffix, as in árotron, "plow" as spelled in the U.S. or "plough", as spelled by the British; from the Greek stem aroun, "to plow".

The suffix -tron is the result of the combining form extracted from electron, used with nouns or combining forms, principally in the names of electron tubes (ignitron; klystron; magnetron) and of devices for accelerating subatomic particles (cosmotron; cyclotron); also, more generally, in the names of any kind of chamber or apparatus used in experiments (biotron).

electronic driftmeter
An electronic instrument for measuring the drift angle or the angle between the longitudinal axis of an aircraft and its path relative to the ground or the angle made by the path of a drifting vessel with its heading.

It may be an attachment to an airborne radar and it is an integral part of a Doppler navigator which refers to the change in electromagnetic frequency that occurs when the source of the radiation and its observer move toward or away from each other.

The faster they come together, the higher the frequency or the faster they move away from each other, the lower the frequency.

electronic dummy, ED
1. A device which is used for simulating impedance, frequency response, and other characteristics of the human body to provide approximately equivalent features in vocal and hearing.
2. A vocal simulator that is a replica of the head and torso of a human, covered with plastisol or artificial flesh which is similar to the acoustical and mechanical properties of real flesh, and having an artificial voice and artificial ears.
electronic efficiency
1. A relation in degree or number between the power at a given frequency which is delivered by an electron stream to an oscillator or amplifier to the average power supplied to the electron flow.
2. The ratio of the power at a desired frequency, delivered by an electron flow or stream to the circuit in an oscillator or amplifier circuit and then to the average power supplied to the stream of data from a source.
electronic emission spectrum
1. Any spectrum produced by the emission of electromagnetic radiation by atoms, molecules, or ions, because of electron excitation or the signal voltage that is applied to the control electrode of an electron tube.
2. A spectrum resulting from the emission of electromagnetic radiation by ions, atoms, and molecules following excitations of their electrons.
electronic energy curve
1. A graph that shows the range of energy levels in a diatomic (double atomic) molecule, based on the distance between the nuclei of its two atoms.
2. A graph of the energy of a diatomic (two atoms) molecule in a given electronic state as a function of the distance between the nuclei of the atoms.
electronic engineering
1. A branch of electrical engineering that deals with the design, fabricating, and operation of electronic devices and systems; such as, radio, television, automation, and computers.
2. Engineering which deals with the practical applications of electronics including the design, fabrication, and operation of circuits, electronic devices, and systems.
electronic fetal monitoring, EFM
1. The use of an electronic device to monitor the vital signs of the fetus or unborn child.
2. An instrument that allows the observation of the fetal heart rates and the maternal uterine contractions which may be applied externally or internally.

With an external monitor, the fetal heart is detected by an ultrasound transducer positioned on the abdomen.

Internal monitoring of the fetal heart rate is accomplished by way of an electrode clipped to the fetal scalp.

electronic fix (s) (noun), electronic fixes (pl)
A navigational fix that is determined by electronic methods; such as, by the use of LORAN (LOng RAnge Navigation) or a long-range, accurate radio navigational system used by a ship or aircraft to confirm or to determine its geographical position or fix: The captain of the ship used an electronic fix to establish his position in the ocean.
electronic flame safeguard
1. In a burner system, an electrode which acts as a safety valve by interrupting the fuel flow from the main burner when its flame is not available.
2. The electrode used in a burner system that detects the main burner flame and interrupts fuel flow if the flame is not indicated.
electronic formula
A structural formula in which the bonds are replaced by dots which indicate pairs of electrons.

A single bond is equivalent to one pair of electrons shared by two atoms.

electronic fuse, radio-frequency heating, influence fuse, variable-time fuse, vt fuse
1. A fuse that is ignited by a self-contained electronic element; for example, a proximity fuse or an electronically triggered device designed to detonate an explosive charge in a missile, etc., at a predetermined distance from the target.
2. A fuse; such as, the radio proximity fuse, set off by an electronic device incorporated within it.

A fuse that detonates a warhead when the target is within some specified region near the fuse.

Radio, radar, photoelectric, or other devices may be used as activating elements.

electronic heating, high-frequency heating, radio-frequency heating or RF heating
1. Heating which is generated by a radio-frequency power source, that produces a radio-frequency current.
2. Heating with radio-frequency current that is produced by an electron-tube oscillator or an equivalent radio-frequency power source.
3. A method of heating a material by inducing a high-frequency current into it or having the material act as the dielectric (having little or no ability to conduct electricity) between two plates charged with a high-frequency current.
electronic horizontal-situation indicator, electronic horizontal situation indicator, EHSI; horizontal-situation indicator, horizontal situation indicator
1. An integrated multicolor map display of an airplane's position combined with a color weather radar display, plus a scale selected by the pilot, together with information on wind directions and velocities, horizontal situations, and deviation from the planned vertical path.
2. An instrument which may display bearing and distance to a navigation aid, magnetic heading, track/course and track/course deviation.
3. An electronically generated display that provides a basic horizontal view of the aircraft's navigation picture.
4. A combination instrument which shows a pilot the actual coarse, as compared to the intended coarse, and the relationship of the aircraft to the glide slope.
electronic humidistat
1. A instrument, used to regulate the degree of humidity, which is composed of two sets of alternate metal conductors that transmit any variations in humidity to a relay amplifier.
2. A humidistat (instrument for measuring humidity) in which a change in the relative humidity causes a change in the electrical resistance between two sets of alternate metal conductors mounted on a small flat plate with plastic coating, and this change in resistance is measured by a relay amplifier.
electronic imaging
1. A system of photography that uses a sensor placed behind a camera lens to translate an image into an electronic signal, which can be stored on a disk or magnetic tape for playback on a VCR or videodisc player and viewing on a television screen.
2. Using computers and/or specialized hardware/software to capture (copy), store, process, manipulate, and distribute "flat information" including documents, photographs, paintings, drawings, and plans, through digitization.
3. A photographic system in which a sensor is placed behind a camera lens to convert an image into an electronic signal, that can be stored for later playback on a television screen.