| sopor | <medicine> Profound sleep from which a person can be roused only with difficulty. Origin: L. Source: Websters Dictionary (01 Mar 1998) |
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| soporiferous | Causing sleep; somniferous; soporific. "Soporiferous medicine." - Soporiferously, Soporiferousness. Origin: L. Soparifer; sopor a heavy sleep + ferere to bring. Source: Websters Dictionary (01 Mar 1998) |
| soporific | 1. Causing or inducing profound sleep. 2. <pharmacology> A drug or other agent which induces sleep. Origin: L. Soporificus (04 Mar 1998) |
| soporose | Soporous Relating to or causing an unnaturally deep sleep. Origin: L. Sopor, deep sleep (05 Mar 2000) |