Etymology
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diesel (adj.)

also Diesel, type of internal combustion engine, 1894, named for Rudolf Diesel (1858-1913), German mechanical engineer who designed this type of engine.

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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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magneto-electric (adj.)

also magnetoelectric, 1831, "characterized by electricity produced by magnets," from magneto- + electric. Magneto-electric machine is from 1831.

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photo-electric (adj.)

1863, "acting by the combination of light and electricity;" by 1880 as "producing light by means of electricity," from photo- + electric

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hydro-electric (adj.)
also hydroelectric, 1827, "produced by a galvanic cell battery," which uses liquid, from hydro- "water" + electric. Meaning "generating electricity by force of moving water" is from 1884. Related: Hydroelectricity.
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pre-electric (adj.)

"occurring or pertaining to the time before the use of electricity," 1879, from pre- + electric.

Just as her father was thus summoned away, Lotty saw Fred in the distance, waving his arms, and looking like an animated semaphore of the pre-electric epoch. [Arthur Locker, "Tollit's Tragedy," in The Graphic, summer 1879]
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Selectric (n.)

proprietary name (IBM) of a popular type of advanced electric typewriter, 1961, from select (v.) + electric.

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