somnifugen.
Etymology: See somni- comb. form and -fuge comb. form.Previous versions of the OED give the stress as: ˈsomnifuge.
rare.
the world > physical sensation > sleeping and waking > state of being awake > [noun] > means of driving away sleep
1890 J. R. Lowell (1894) II. x. 460 He [the nightingale] has a bad character among you as a somnifuge.
This entry has not yet been fully updated (first published 1913; most recently modified version published online June 2021).