by 1902 (earlier procto-colonoscopy, 1896), from colon (n.2) + -scopy. Colonoscope is attested from 1884
"large intestine," late 14c., from Latin colon, Latinized form of Greek kolon (with a short initial -o-) "large intestine," which is of unknown origin.
word-forming element meaning "viewing, examining, observing," from Modern Latin -scopium, from Greek -skopion, from skopein "to look at, examine" (from PIE root *spek- "to observe").
updated on January 22, 2018