actinoid
/ˈæktɪnɔɪd/
adjective
- Having a ray-like or star-shaped form; resembling a ray or radiating structure.
- The coral had an actinoid shape, with branches spreading out in all directions.
- Under the microscope, the crystal showed an actinoid pattern of growth.
- The artist drew an actinoid design with lines radiating from a central point.
noun
- Any of the series of radioactive metallic elements from actinium to lawrencium in the periodic table.
- The chemistry of actinoids is complex due to their radioactivity.
- Actinoids like uranium and plutonium are important for nuclear energy.
- Students learned about the actinoid series in their chemistry class.