from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Inducing or tending to induce sleep.
- adj. Drowsy.
- n. A drug or other substance that induces sleep; a hypnotic.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Something inducing sleep, especially a drug.
- n. Something boring or dull.
- adj. Tending to induce sleep.
- adj. boring, dull
from the GNU version of the Collaborative International Dictionary of English
- adj. Causing sleep; tending to cause sleep; soporiferous.
- n. A medicine, drug, plant, or other agent that has the quality of inducing sleep; a narcotic.
from The Century Dictionary and Cyclopedia
- Tending to produce sleep.
- n. Anything which causes sleep, as certain medicines.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. inducing mental lethargy
- n. a drug that induces sleep
- adj. sleep inducing
From French soporifique, from Latin sopor ("deep sleep"), from Proto-Indo-European *swepōr, from Proto-Indo-European *swep-. Unrelated to stupor (distinct in Proto-Indo-European). (Wiktionary)