-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 infusion device, EID
1. An instrument for monitoring intravenous infusions.

The device may have an alarm in case the flow is restricted because of an occlusion of the line which will result in an alarm that will go off when a preset pressure limit is determined.

Most electronic infusion devices are equipped to stop the flow of the infused liquid if an accidental free-flow occurs.

2. An automated system of introducing a fluid other than blood into a vein.

The device may have programmable settings that control the amount of fluid to be infused, rate, low-volume notification level, and a keep-vein-open rate.

Some electronic infusion devices have titration modes that allow a change in the delivery rate without interrupting fluid flow. They also allow delivery in milliliters per hour.

The term titration is the process, operation, or method of determining the concentration of a substance in a solution to which the addition of a reagent having a known concentration is made in carefully measured amounts until a reaction of definite and known proportion is completed, as shown by a color change or by electrical measurement, and then calculating the unknown concentration.

electronic intelligence, ELINT
1. A worldwide U.S. Air Force network which has fixed stations, specially equipped aircraft, and reconnaissance satellites to monitor and record enemy electromagnetic emissions.

These signals are processed to give the nature and deployment of enemy warning and missile guidance radars, fire control, and countermeasures systems.

2. Technical and geolocation intelligence derived from foreign noncommunications electromagnetic radiations emanating from other than nuclear detonations or radioactive sources.
3. Electronic systems, apparatus, and operations for obtaining information concerning a military enemy's capabilities, intentions, plans, and order of battle.
electronic interference
1. A disturbance from nearby electrical or electromagnetic activity which causes an electronic device to function incorrectly.
2. Any electrical or electromagnetic disturbance that causes undesirable responses in electronic equipment.
3. An electric or electromagnetic disturbance which causes undesirable responses in electronic equipment.

Electric interference refers specifically to an interference that is caused by the operation of an electric apparatus which is not designed to radiate electromagnetic energy.

electronic jammer, jammer, electronic jamming, active jamming
1. A transmitter used in the jamming of radio or radar transmissions.
2. Radiation or re-radiation of electromagnetic waves so as to impair the usefulness of a specific segment of the radio spectrum that is being used by a military enemy for communication or radar.
3. To interfere with or to prevent the clear reception of (broadcast signals) by electronic methods.
electronic line scanning
1. In a television system, a method by which a spot of light or another energy source moves along a given path by electronic means.
2. In facsimile copying, a method by which a spot on a cathode-ray tube moves across the copy by electronic actions.
3. A method that provides motion of the scanning spot along the scanning line controlled by electronic procedures.
4. Facsimile scanning in which a spot on a cathode-ray tube moves across the copy electronically while the record sheet or subject copy is moved mechanically in a perpendicular direction.
electronic listening device
1. An instrument that picks up sound waves from an essentially private conversation and reproduces them in a form, generally on magnetic tape, that then can be used as evidence.
2. A device used to capture the sound waves of conversations originating in an supposedly private setting in a form, usually as a magnetic tape recording, which can be used against the target by anyone with negative intentions.
electronic locator, metal detector, metal locator, radio metal locator
1. An electronic instrument used for detecting concealed metal objects; such as, guns, knives, or buried pipelines, generally by radiating a high-frequency electromagnetic field and then detecting the change produced in that field by the ferrous or nonferrous metal object that the user is looking for.
2. A portable electronic device with a search head that is swept over the ground and used to detect buried metal objects such as coins.
3. An electronic device that registers the presence of metal; used, for example, to detect metal weapons or to screen passengers at an airport.
4. An electronic tool used in the food industry to check for the presence of pieces of metal that might have accidentally gotten into food during the processing activities.
electronic locking
1. A method used to prevent the activation of a switch until a particular sequence of signals is received by the circuit.
2. A technique for preventing the operation of a switch until a specific electrical signal (the unlocking signal) is introduced into circuitry associated with the switch.

Usually, but not necessarily, the unlocking signal is a binary sequence.

electronic logger; Geiger-Mueller probe, Geiger probe
A Geiger-Mueller is a counter in a watertight container, which is lowered into a borehole to log the intensity of the gamma rays produced by radioactive substances in traversed rock or across a thin section of stone.
electronic magnetic moment, electron magnetic moment, electron dipole moment
1. The total amount of polarization (dipole moment) caused by the movement of electrons within an atom.
2. The magnetic dipole moment which an electron possesses by virtue of its spin.
3. The total magnetic dipole moment associated with the orbital motion of all the electrons of an atom and the electron spins.

This is opposed to a nuclear magnetic moment.

electronic mail; e-mail, E-mail, email
1. A computer-system communications service in which text messages are sent to a central computer or over a network and retrieved by the addressee.
2. The electronic transmission of letters, messages, and memos via a communications network; now more often via computer connections.
3. A system for sending messages by computer, Telex, facsimile telegraph, or other electronic means instead of by post.
4. Messages sent by one user of a computerized communications system and retrieved almost instantly by other users.

The messages may be transmitted with a modem through telephone lines or, in some cases, by shortwave radio and it can be in many forms, including mailgrams, twx, and facsimile transmission devices.

electronic microradiography
1. A procedure in which electrons released from microscopic irradiated objects are used to produce a photographic image.
2. Microradiography of very thin specimens in which the emission of electrons from an irradiated object, either the specimen or a lead screen behind it, is used to produce a photographic image of the specimen, which is then enlarged.

Microradiography is a technique for the study of surfaces of solids by monochromatic-radiation (such as X-ray) contrast effects shown by means of projection or enlargement of a contact radiograph.

electronic motor control; direct-current motor control, motor control
1. An electronic instrument which adjusts the speed of a DC (direct current) motor when it is driven by an AC (alternating current) power line.
2. A control circuit used to change or to vary the speed of a direct-current (DC) motor operated from an alternating-current (AC) power line.

Silicon controlled rectifiers or power transistors rectify or correct the voltage and vary the field current of the motor.

electronic multimeter
1. An instrument that uses semiconductors or electron-tube circuits to measure resistance, electric current, and voltage.
2. A multimeter that uses semiconductor or electron-tube circuits to drive a conventional multiple-scale meter.
3. An apparatus that employs the characteristics of an electron-tube circuit for the measurement of electrical quantities, at least one of which is voltage or current, or a single calibrated scale.

When a digital display replaces the moving-coil meter, it is called a "digital multimeter".

electronic musical instrument
1. A musical instrument in which an audio signal is produced by a pickup or audio oscillator and amplified electronically to feed a loudspeaker; such as, in an electric guitar, electronic carillon, electronic organ, or electronic piano.
2. A musical device that generates sounds electronically.