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somnoriferous

somnoˈriferous, a. Obs.
  [Erroneous form of somniferous, after soporiferous.]
  Soporific.

1590 P. Barrough Meth. Physick i. xv. (1639) 24 Water wherein..poppy seed hath been sodden, or some somnoriferous compound. Ibid. ii. x. 88 Sirupes of Poppy, and other somnoriferous medicines.

  So somnoˈrific a.

1865 ‘Annie Thomas’ On Guard ii, The first scene opened on a somnorific, sultry summer afternoon in London. 1880 G. A. Townsend Tales Chesapeake 196 The somnorific air of the Springs.

Oxford English Dictionary

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