Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of soporiferous is as below...

Sleepy :: Sleepy (n.) Tending to induce sleep; soporiferous; somniferous; as, a sleepy drink or potion..

Soporific :: Soporific (a.) Causing sleep; tending to cause sleep; soporiferous; as, the soporific virtues of opium..

Slumberous :: Slumberous (a.) Inviting slumber; soporiferous.

Soporiferous :: Soporiferous (a.) Causing sleep; somniferous; soporific.

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