Etymology
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Words related to -scope

*spek- 
Proto-Indo-European root meaning "to observe."

It forms all or part of: aspect; auspex; auspices; auspicious; bishop; circumspect; conspicuous; despicable; despise; episcopal; especial; espionage; espy; expect; frontispiece; gyroscope; haruspex; horoscope; inspect; inspection; inspector; introspect; introspection; perspective; perspicacious; perspicacity; prospect; prospective; respect; respite; retrospect; scope; -scope; scopophilia; -scopy; skeptic; species; specimen; specious; spectacle; spectacular; spectrum; speculate; speculation; speculum; spice; spy; suspect; suspicion; suspicious; telescope.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit spasati "sees;" Avestan spasyeiti "spies;" Greek skopein "behold, look, consider," skeptesthai "to look at," skopos "watcher, one who watches;" Latin specere "to look at;" Old High German spehhon "to spy," German spähen "to spy."
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cystoscopy (n.)

1910, "examination of the bladder with a cystoscope" (1889), from Latinized combining form of Greek kystis "bladder" (which is of unknown origin) + -scope. Related: Cystoscopic.

fluoroscopy (n.)
1896, from fluoroscope (1896) "device for observing x-rays by means of action in fluorescent substances," from fluoro- + -scope. Related: Fluoroscopic.
hygroscope (n.)
"device which indicates atmospheric humidity," 1660s, from hygro- "wet, moist; moisture" + -scope. It indicates the presence of moisture but not the amount (which is measured by a hygrometer). Related: Hygroscopic.
kaleidoscope (n.)

"optical instrument creating and exhibiting, by reflection, a variety of beautiful colors and symmetrical forms," 1817, literally "observer of beautiful forms," coined by its inventor, Scottish scientist David Brewster (1781-1868), from Greek kalos "beautiful, beauteous" (see Callisto) + eidos "shape" (see -oid) + -scope, on model of telescope, etc. They sold by the thousands in the few years after their invention, but Brewster failed to secure a patent.

Figurative meaning "constantly changing pattern" is first attested 1819 in Lord Byron, whose publisher had sent him one of the toys. As a verb, from 1891. A kaleidophone (1827) was invented by English inventor Charles Wheatstone (1802-1875) to make sound waves visible.

microscope (n.)

"optical instrument which by means of a lens or lenses magnifies and renders visible minute objects or details of visible bodies," 1650s, from Modern Latin microscopium, literally "an instrument for viewing what is small;" see micro- + -scope. The dim southern constellation Microscopium was among those introduced by La Caille in 1752.

ophthalmoscope (n.)

"instrument for viewing the interior of the eye," especially the retina, 1857 in English; coined 1852 by German physician and physicist Hermann Ludwig Ferdinand von Helmholtz; see ophthalmo- + -scope.

oscilloscope (n.)

"instrument for visually recording an electrical wave," by 1907, a hybrid formed from Latin oscillare "to swing" (see oscillation) + -scope. In reference to the modern cathode-ray oscilloscope, by 1927.

periscope (n.)

viewing apparatus on a submarine, by which objects in a horizontal view may be seen through a vertical tube, 1899, formed in English from peri- "around" + -scope "instrument for viewing." Earlier (1865) a technical term in photography. Related: Periscopic.

spectroscope (n.)
1861, from spectro- + -scope. A Greek-Latin hybrid, both elements from the same PIE root. Related: Spectroscopic; spectroscopy.