- Learn English
-
Learn grammar
-
List of words
-
Study your cards
-
Hang On, Man!
-
Audio Books
-
More apps
- Recent searches
-
activate
-
go to bed
-
ad infinitum
-
shaved
-
actiniopteris
-
actinomycetal
-
action painting
-
actinomyxidian
-
send in
-
pygmy
- 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
