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Origin and history of speedometer

speedometer(n.)

1904, from speed + -meter with connective -o-. A Germanic-Greek hybrid and thus much execrated.

[T]he ancient Greeks & Romans knew what speed was, & yet no-one supposes they called it speed, whence it follows that speedo- & speedometer are barbarisms. [Fowler]

The correct classical formation is tachometer. Speed indicator also was used. Sometimes mistakenly used of the odometer.

also from 1904

Entries linking to speedometer

speed(n.)

Middle English spede, from Old English sped "success, a successful course; prosperity, riches, wealth; luck, good fortune; opportunity, advancement," from Proto-Germanic *spodiz (source also of Old Saxon spod "success," Dutch spoed "haste, speed," Old High German spuot "success," Old Saxon spodian "to cause to succeed," Middle Dutch spoeden, Old High German spuoten "to haste").

This is reconstructed to be from PIE *spo-ti-, from root *spes- or *speh- "prosperity" (source also of Hittite išpai- "get full, be satiated;" Sanskrit sphira "fat," sphayate "increases;" Latin spes "hope," sperare "to hope;" Old Church Slavonic spechu "endeavor," spĕti "to succeed," Russian spet' "to ripen;" Lithuanian spėju, spėti "to have leisure;" Old English spōwan "to prosper").

The meaning "rapidity of movement, quickness, swiftness" emerged in late Old English (at first usually adverbially, in dative plural, as in spedum feran). The meaning "rate of motion or progress" (whether fast or slow) is from mid-14c. The sense of "gear of a machine" is attested from 1866. Slang use in reference to methamphetamine or a related drug is attested by 1967, from its effect on users.

Speed limit "maximum speed" of a vehicle (originally a locomotive), limited either by law or capability, is from 1879; the police officer's speed-trap is from 1908 (trap (n.1) in the police sense is by 1906). Speed bump as a traffic control device is by 1975; the figurative use is by 1990s. Full speed "highest rate of speed" is recorded from late 14c. Speed reading first attested 1965. Speedball "mix of cocaine and morphine or heroin" is recorded from 1909.

tachometer(n.)

also tacheometer, "speed-measuring instrument for a machine or engine," 1810, coined by its inventor, Bryan Donkin (1768-1855), from tacho- "speed" + -meter. Related: Tachometry.

-meter

word-forming element meaning "device or instrument for measuring;" commonly -ometer, occasionally -imeter; from French -mètre, from Greek metron "a measure," from PIE root *me- (2) "to measure."

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    meter
    also metre, "poetic measure, metrical scheme, arrangement of language in a series of rhythmic movements," Old English meter "meter, versification," from Latin mētrum, from Greek metron "meter, a verse; that by which anything is measured; measure, length, size, limit, proportion"
    plot
    late Old English plot "small piece of ground of defined shape," a word of unknown origin. The sense of "ground plan," and thus "map, chart, survey of a field, farm, etc." is from 1550s. Plat is a Middle English collateral form. The meaning "a secret, plan, fully formulated scheme
    excruciate
    "to torture, torment, inflict very severe pain on," as if by crucifying, 1560s, from Latin excruciatus, past participle of excruciare "to torture, torment, rack, plague;" figuratively "to afflict, harass, vex, torment," from ex "out, out from; thoroughly" (see ex-) + cruciare "ca
    Russia
    nation in Eastern Europe with a large possession in north Asia, 1530s, from Medieval Latin Russi "the people of Russia," from Rus, the native name of the people and the country (source of Arabic Rus, Medieval Greek Rhos), originally the name of a group of Swedish merchant/warrior
    forget
    Old English forgietan "lose the power of recalling to the mind; fail to remember; neglect inadvertently," from for-, used here probably with privative force, "away, amiss, opposite" + gietan "to grasp" (see get (v.)). To "un-get," hence "to lose" from the mind. A common Germanic
    illusion
    mid-14c., "mockery, scorning, derision;" late 14c., "act of deception; deceptive appearance, apparition; delusion of the mind," from Old French illusion "a mocking, deceit, deception" (12c.), from Latin illusionem (nominative illusio) "a mocking, jesting, jeering; irony," from pa
    arrogance
    "a manifest feeling of superiority of one's worth or importance, combined with contempt of others," c. 1300, from Old French arrogance (12c.), from Latin arrogantia "presumption, pride, haughtiness," abstract noun from arrogantem (nominative arrogans) "assuming, overbearing, inso
    revival
    1650s, "act of reviving after decline or discontinuance;" specifically from 1660s as, "the bringing back to the stage of a play which has not been presented for a considerable time;" from revive + -al (2). The sense of "a general and extraordinary religious awakening in a communi
    mitigate
    early 15c., "relieve (pain); make mild or more tolerable; reduce in amount or degree," from Latin mitigatus, past participle of mitigare "soften, make tender, ripen, mellow, tame," figuratively, "make mild or gentle, pacify, soothe," ultimately from mitis "gentle, soft" + root of
    peculiar
    mid-15c., "belonging exclusively to one person," also "special, particular," from Old French peculiaire and directly from Latin peculiaris "of one's own (property)," from peculium "private property," literally "property in cattle" (in ancient times the most important form of prop

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