- Learn English
-
Learn grammar
-
List of words
-
Study your cards
-
Hang On, Man!
-
Audio Books
-
More apps
- Recent searches
-
actinometry
-
activase
-
pour down
-
lather
-
active application
-
ad infinitum
-
active citizen
-
pail
-
acromicria
-
ingest
- Hide translation
actinon
actinon /ˈækˌtɪnɒn/
noun
-
Any of a series of radioactive elements with atomic numbers 89 through 103
(
actinide
, actinoid
, actinon
)
any of a series of radioactive elements with atomic numbers 89 through 103