American Heritage Dictionary
(3)
Century Dictionary
(2)
GNU Webster's 1913
(2)
WordNet
(3)
Elsewhere on the web
His delivery was as soporific, as it has been for years.— The Guardian World News
There is a misunderstanding about the meaning of the word soporific and when Thompson explains it to McDonald they both enjoy a laugh, at themselves mostly, they let go a little, and it is one of the most human and intimate moments in the film up until that point.— OnMilwaukee.com
After dinner, I lay down on the couch, with the Dial in my hand as a soporific, and had a short nap; then began to journalize Mr. Emerson came, with a sunbeam in his face; and we had as good a talk as I ever remember to have had with him.— The Atlantic Monthly, Volume 18, No. 107, September, 1866
They proved to be soporific, for he gradually reclined backwards on the green turf and fell asleep, surrounded by and partially covered with grapes, like a drunken and disorderly Bacchus Now Tyrker was a man in robust health; full of energy and high spirits.— The Norsemen in the West

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a year.
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