“to look,” “to examine,” “to observe” — Noun-forming suffix — “instrument for examining or viewing”
The word entered English in the 1820s as microscope (noun), borrowed from French microscope, from Late Latin microscopium, from Greek μικροσκοπεῖν (mikroskopein) — literally “to look at small things.” The term stethoscope appeared in the 1810s (coined by Laënnec), and ophthalmoscope in the 1850s. The root skopein (“to look”) connects -scope to the entire observation and examination suffixes: microscope (mikros + skopein → instrument for viewing small things), stethoscope (stethos + skopein → instrument for listening to the chest), and ophthalmoscope (ophthalmos + skopein → instrument for viewing the eye). The instrument-forming suffix-scope is extremely productive across nearly all medical specialties: e.g., laryngoscope, endoscope, gonioscope, retinoscope, and cardioscope.