noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   An instrument for telegraphically transmitting a picture and reproducing its image as a positive or negative. The transmitter includes a camera obscura and a row of minute selenium cells. The receiver includes an oscillograph, relay, equilibrator, and an induction coil whose sparks perforate a paper with tiny holes that form the image. historical

Etymology

From telegraph + -o- + -scope.

Related phrases

camera obscurainduction coil

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.