Definition of retinoscope in US English:

retinoscope

noun

Ophthalmology
  • A device used to perform retinoscopy, typically incorporating a mirror, light source, and condensing lens.

Origin

Mid 19th century (in an earlier sense). From retino- + -scope. In sense 1 after French rétinoscope; compare earlier retinoscopy.

Pronunciation

retinoscope

/ˈrɛtɪnəskəʊp/