Romanian ⇄ Arabic Basque Bulgarian Catalan Chinese Croatian Czech Danish Dutch English Estonian Finnish French German Greek Hungarian Irish Italian Latin Latvian Lithuanian Maltese Norwegian Bokmål Polish Portuguese Russian Slovak Slovene Spanish Swedish Turkish Ukrainian

actiniu form.
chem.	actinium
environ.	actinium A radioactive element of the actinide series, occurring as a decay product of uranium. It is used as an alpha particle source and in neutron production