Definition of "soporiferous" []

• Inducing or tending to induce sleep; soporific. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The invalid held up, as if in thankfulness, his wasted hands to Heaven, and resisting no longer the soporiferous operation of the elixir, sunk down in a gentle sleep."
• "Into this cavern the sun never enters, and a perpetual stillness reigns, no noise being heard but the soft murmur caused by a stream of the river Lethe, which creeps over the pebbles, and invites to slumber; at its entrance grow poppies, and other soporiferous herbs."
• "All this I was told; for, while the whole operation was performing, I lay in a profound sleep, by the force of that soporiferous medicine infused into my liquor."