cathode(redirected from cathodes)
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Related to cathodes: Cold Cathodes, Copper cathodes
n. Abbr. ka
1. A negatively charged electrode, as of an electrolytic cell, storage battery, diode, or electron tube.
2. The positively charged terminal of a primary cell or a storage battery that is supplying current.
[Greek kathodos, descent : kat-, kata-, cata- + hodos, way, path.]
ca·thod′ic (kă-thŏd′ĭk) adj.
1. (General Physics) the negative electrode in an electrolytic cell; the electrode by which electrons enter a device from an external circuit
2. (General Physics) the negatively charged electron source in an electronic valve
3. (General Physics) the positive terminal of a primary cell
[C19: from Greek kathodos a descent, from kata- down + hodos way]
cathodal, cathodic, caˈthodical adj
1. the electrode or terminal by which current leaves an electrolytic cell, voltaic cell, battery, etc.
2. the positive terminal of a voltaic cell or battery.
3. the negative terminal, electrode, or element of an electron tube or electrolytic cell.
[1825–35; < Greek káthodos a way down]
ca•thod′ic (kæˈθɒd ɪk) adj.
1. The negative electrode in an electrolytic cell, toward which positively charged particles are attracted. The cathode has a negative charge because it is connected to the negatively charged end of an external power supply.
2. The positive electrode in a voltaic cell, such as a battery, toward which negatively charged particles are attracted. The cathode gets its positive charge from the chemical reaction that happens inside the battery, not from an external source. Compare anode.
1. The electrode carrying the negative charge in a solution undergoing electrolysis.
2. A negative electrode.
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|Noun||1.||cathode - a negatively charged electrode that is the source of electrons entering an electrical device|
cold cathode - a cathode that is a source of electrons without being heated
electrode - a conductor used to make electrical contact with some part of a circuit
electrolytic cell - a cell containing an electrolyte in which an applied voltage causes a reaction to occur that would not occur otherwise (such as the breakdown of water into hydrogen and oxygen)
photocathode - a cathode that emits electrons when illuminated
electron tube, thermionic tube, thermionic vacuum tube, thermionic valve, vacuum tube, tube - electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
anode - a positively charged electrode by which electrons leave an electrical device
|2.||cathode - the positively charged terminal of a voltaic cell or storage battery that supplies current|
galvanic cell, primary cell, voltaic cell - an electric cell that generates an electromotive force by an irreversible conversion of chemical to electrical energy; cannot be recharged
anode - the negatively charged terminal of a voltaic cell or storage battery that supplies current