Soporiferous \Sop`o*rif"er*ous\, a. [L. soparifer; sopor a heavy
sleep + ferere to bring.]
Causing sleep; somniferous; soporific. "Soporiferous
medicine." --Swift.
[1913 Webster] -- {Sop`o*rif"er*ous*ly}, adv. --
{Sop`o*rif"er*ous*ness}, n.
[1913 Webster]