Etymology
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after-burner (n.)

1947, "device on the tailpipe of a jet engine to increase thrust," from after + burner.

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fader (n.)

sound control device, 1931, agent noun from fade (v.).

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componentry (n.)

"component parts of a device or system," 1956, from component + -ry.

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radiography (n.)

1896, "science or process of making images of objects on a sensitive plate by means of x-rays," from radiograph, the word for such an image-making device; from radio-, combining form of radiation, + -graph. Radiograph was used earlier as "device to measure and record the intensity of sunshine" (1880).

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quipu (n.)

ancient Inca recording device using knotted cords, 1704, from Quechua (Inca) quipu "knot."

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contraceptive 

1891 (n.) "a contraceptive device or drug;" 1915 (adj.) "pertaining to contraception; preventing conception," from stem of contraception + -ive.

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loud-speaker (n.)

also loudspeaker, "device for amplifying sound using an electric current," 1898, from loud (adj.) + speaker (n.).

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machination (n.)

late 15c., machinacion, "a plotting, an intrigue," from Old French machinacion "plot, conspiracy, scheming, intrigue" and directly from Latin machinationem (nominative machinatio) "device, contrivance, machination," noun of action from past-participle stem of machinari "to contrive skillfully, to design; to scheme, to plot," from machina "machine, engine; device trick" (see machine (n.)). Related: Machinations.

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auto-focus (n.)

"device that focuses automatically," by 1933 in photography, originally of enlargers; by 1942 of lenses, from auto- + focus (n.).

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door-stop (n.)

"device placed behind a door to prevent it from being opened too widely," 1859, from door + stop (n.).

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