Etymology
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incinerator (n.)

"device for waste disposal by burning," 1872, from incinerate + Latinate agent noun suffix -or.

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fylfot (n.)

supposedly a native name for the swastika (used as a decorative device), but only attested in a single, damaged c. 1500 manuscript, and in that it might rather refer to any sort of device used to fill the bottom (foot) of a design. "[I]t is even possible that it may have been a mere nonce-word" [OED].

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machine (v.)

mid-15c., "decide, resolve," from Old French and Latin usages, from Latin machina "machine, engine, military machine; device, trick; instrument," from Greek makhana, Doric variant of Attic mēkhanē "device, tool; contrivance, cunning" (see machine (n.)). Meaning "to apply machinery to, to make or form on or by the aid of a machine" is from 1878. Related: Machined; machining.

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photometer (n.)

"instrument used to measure the intensity of light," 1778, from photo- "light" + -meter "device for measuring." Related: Photometric; photometry (1760).

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camera obscura (n.)

1725, "a darkened room;" c. 1730, "a device for project pictures;" see camera.

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humidifier (n.)

"device for making air more humid," by 1881, agent noun from humidify.

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pulser (n.)

by 1940, "device that gives electrical pulses," agent noun from pulse (v.).

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capacitor (n.)

"device which stores electricity," 1926, from capacity, in reference to electrical conductors, with Latinate agent-noun ending.

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pager (n.)

"device that emits a signal when activated by a telephone call," 1968, agent noun from page (v.1).

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air-freshener (n.)

"device to disperse chemicals meant to mask unpleasant odors," 1945, from air (n.1) + agent noun from freshen.

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