Etymology
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Words related to electric

electrical (adj.)
1630s, "giving off electricity when rubbed," from electric + -al (1). Meaning "relating to electricity, run by electricity" is from 1746. Related: Electrically.
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amber (n.)

mid-14c., ambre grice "ambergris; perfume made from ambergris," from the phrase in Old French (13c.) and Medieval Latin, from Arabic 'anbar "ambergris, morbid secretion of sperm-whale intestines used in perfumes and cookery" (see ambergris), which was introduced in the West at the time of the Crusades. Arabic -nb- often is pronounced "-mb-."

In Europe, the word amber was extended to fossil resins from the Baltic (late 13c. in Anglo-Latin; c. 1400 in English), and this has become the main sense as the use of ambergris has waned. Perhaps the perceived connection is that both were found washed up on seashores. Or perhaps it is a different word entirely, of unknown origin. Formerly they were distinguished as white or yellow amber for the Baltic fossil resin and ambergris "gray amber;" French distinguished the two substances as ambre gris and ambre jaune.

Remarkable for its static electricity properties, Baltic amber was known to the Romans as electrum (compare electric). Amber as an adjective in English is from c. 1500; as a color name 1735. In the Old Testament it translates Hebrew chashmal, a shining metal.

electrician (n.)
1751, "scientist concerned with electricity;" 1869 as "technician concerned with electrical systems and appliances;" see electric + -ian.
electricity (n.)

1640s (Browne, from Gilbert's Modern Latin), from electric (q.v.) + -ity. Originally in reference to friction.

Electricity seems destined to play a most important part in the arts and industries. The question of its economical application to some purposes is still unsettled, but experiment has already proved that it will propel a street car better than a gas jet and give more light than a horse. [Ambrose Bierce, "The Cynic's Word Book," 1906]
electrify (v.)
1745, "to charge with electricity, cause electricity to pass through;" see electric + -fy. Figurative sense recorded by 1752. Meaning "convert a factory, industry, etc., to electrical power" is by 1902. Related: Electrified; electrifying.
electro- 

before vowels electr-, word-forming element meaning "electrical, electricity," Latinized form of Greek ēlektro-, combining form of ēlektron "amber" (see electric). As a stand-alone, formerly often short for electrotype, electroplate.

electron (n.)
coined 1891 by Irish physicist George J. Stoney (1826-1911) from electric + -on, as in ion (q.v.). Electron microscope (1932) translates German Elektronenmikroskop.
electrum (n.)
"alloy of gold and up to 40% silver," late 14c. (in Old English elehtre), from Latin electrum "alloy of gold and silver," also "amber" (see electric). So called probably for its pale yellow color. "A word used by Greek and Latin authors in various meanings at various times" [Century Dictionary"]. In Greek, usually of amber but also of pure gold. The Romans used it of amber but also of the alloy. The sense of "amber" also occasionally is found in English. "At all times, and especially among the Latin writers, there is more or less uncertainty in regard to the meaning of this word" ["Century Dictionary"].
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.
magneto-electric (adj.)

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