You searched for: “actinouranium”
actinouranium, actino-uranium (s) (noun) (no pl)
The former name of the radioactive uranium isotope of mass 235: Actinouranium is now called uranium-235 and fissionable with slow neutrons.
This entry is located in the following unit: actino-, actin-, actini-, -actinal, actis- + (page 5)