Seconal
trademark
Sec·o·nal ˈse-kə-ˌnȯl 
-ˌnal,
-nᵊl
—used for a preparation of secobarbital
Medical Definition
Seconal
trademark
Sec·o·nal ˈsek-ə-ˌnȯl -ˌnal
-ˌnal -ən-ᵊl
—used for a preparation of the sodium salt of secobarbital