somniferasDictionary entriessomnifer, somnifera, somniferum:Adjective · 1st declensionFrequency:Lesser= inducing sleep;Entry →acc. pl. (f.)ExamplesLiber SeptimusGaius Valerius Flaccus from ARGONAVTICA"...repone, redde diem noctemque mihi, da prendere vestes somniferas ipsaque oculos componere virga. tu quoque nil, mater, prodes..."