- Learn English
-
Learn grammar
-
List of words
-
Study your cards
-
Hang On, Man!
-
Audio Books
-
More apps
- Recent searches
-
flatter
-
bough
-
muscle
-
acute lymphoblastic leukemia
-
possibly
-
hypocritically
-
pogrom
-
snubbing
-
feature film
-
trusted
- Hide translation
actinium
actinium /ækˈtɪnɪəm/
noun
-
A radioactive element of the actinide series; found in uranium ores
(
Ac
, actinium
, atomic number 89
)
a radioactive element of the actinide series; found in uranium ores
