Definition of nyctograph in US English:

nyctograph

noun

  • A device invented by Charles Dodgson (‘Lewis Carroll’) with which a person can record ideas (especially those remaining after sleep) at night in bed without fully waking up.

Origin

Late 19th century; earliest use found in ‘Lewis Carroll’ (1832–1898), author, mathematician, and photographer (real name Charles Lutwidge Dodgson). From nycto- + -graph. Compare French nyctographe machine enabling the blind to write or the sighted to write in the dark, and Hellenistic Greek νυκτογραϕία writing by night.