noun. the sodium salt of amobarbital that is used as a barbiturate; used as a sedative and a hypnotic.
noun. a barbiturate with sedative and hypnotic effects; used to relieve insomnia and as an anticonvulsant.
noun. ['ˈsoʊdiːəm'] a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt).