Etymology
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Words related to electro-

electric (adj.)

1640s, first used in English by physician Sir Thomas Browne (1605-1682), apparently coined as Modern Latin electricus (literally "resembling amber") by English physicist William Gilbert (1540-1603) in treatise "De Magnete" (1600), from Latin electrum "amber," from Greek ēlektron "amber" (Homer, Hesiod, Herodotus), also "pale gold" (a compound of 1 part silver to 4 of gold); which is of unknown origin.

Vim illam electricam nobis placet appellare [Gilbert]

Originally the word described substances which, like amber, attract other substances when rubbed. Meaning "charged with electricity" is from 1670s; the physical force so called because it first was generated by rubbing amber. In many modern instances, the word is short for electrical. Figurative sense is attested by 1793. Electric light is from 1767. Electric toothbrush first recorded 1936; electric blanket in 1930. Electric typewriter is from 1958. Electric guitar is from 1938; electric organ coined as the name of a hypothetical future instrument in 1885.

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electrocute (v.)
"execute by electricity," 1889, American English, from electro- + back half of execute. The method first was used Aug. 6, 1890, in New York state, on William Kemmler, convicted of the murder of his common-law wife. In reference to accidental death by 1909. Electric chair is also first recorded 1889, the year the one used on Kemmler was introduced in New York as a humane alternative to hanging. Related: Electrocuted; electrocuting.
electrode (n.)

"one of the two ends of an open electrical circuit," 1834, coined by English physicist and chemist Michael Faraday from electro- + Greek hodos "a way, path, track, road" (a word of uncertain origin; see Exodus) on the same pattern as anode, cathode.

electroencephalogram (n.)
1934, from electro- + encephalo-, combining form of Modern Latin encephalon "brain" (see encephalitis) + -gram.
electrolysis (n.)

"decomposition into constituent parts by an electric current," 1834; the name was introduced by Faraday on the suggestion of the Rev. William Whewell, English polymath, from electro- + Greek lysis "a loosening," from lyein "to loosen, set free" (from PIE root *leu- "to loosen, divide, cut apart"). Originally of tumors, later (1879) of hair removal. Related: electrolytic.

electrolyte (n.)
"substance decomposed by electrolysis," 1834, from electro- + Greek lytos "loosed," from lyein "to unfasten, loose, loosen, untie" (from PIE root *leu- "to loosen, divide, cut apart").
electromagnet (n.)
also electro-magnet, "magnet which owes its magnetic properties to electric current," 1822; see electro- + magnet.
electromagnetic (adj.)

also electro-magnetic, "Pertaining to electromagnetics, or to the relation between electricity and magnetism; of the nature of electromagnetism," 1821; see electro- + magnetic.

electromagnetism (n.)

also electro-magnetism, "the collective term for phenomena which rest upon the relation between electric currents and magnetism," 1821; see electro- + magnetism.