Etymology
Advertisement
capacitor (n.)
"device which stores electricity," 1926, from capacity, in reference to electrical conductors, with Latinate agent-noun ending.
Related entries & more 
Advertisement
pager (n.)
"device that emits a signal when activated by a telephone call," 1968, agent noun from page (v.1).
Related entries & more 
transformer (n.)
c. 1600, "one who or that which transforms," agent noun from transform (v.). Meaning "device to reduce electrical currents" is from 1882.
Related entries & more 
sandbox (n.)

also sand-box, 1570s as a perforated device to sprinkle sand, from sand (n.) + box (n.1). From 1680s as "a box holding sand." In U.S. locomotives, "a device to put sand on the rails when wet wheels slip" (by 1849). By 1891 as a low-sided sand-pit for children's play.

Related entries & more 
dehumidifier (n.)

"device for removing humidity from the air," 1909, agent noun from dehumidify (1908); see de- + humidify.

Related entries & more 
Advertisement
latch (n.)
"device for catching and retaining," especially "a fastening for a door," late 13c., probably from latch (v.).
Related entries & more 
separator (n.)
c. 1600, "separatist," agent noun from separate (v.). As a mechanical device for separating, from 1831.
Related entries & more 
compactor (n.)

1590s, "one who puts together," agent noun from compact (v.1). From 1947 as "device for compacting."

Related entries & more 
regulator (n.)

1650s, "one who regulates" in any sense, agent noun in Latin form from regulate. In English history from 1680s; in American history from 1767, applied to local posses that kept order (or disturbed it) in rural regions. From 1702 as "device for controlling machinery in motion;" the specific sense of "mechanical device or clock used to set the time of other pieces" is from 1758.

Related entries & more 
MIDI 

"device for connecting computers and electronic musical instruments," 1983, acronym for Musical Instrument Digital Interface.

Related entries & more 

Page 4