protactínio

== Portuguese == === Etymology === From prot(o)- (“proto-”) +‎ actínio (“actinium”), from Ancient Greek ἀκτίς (aktís, “ray”). === Pronunciation === Hyphenation: pro‧tac‧tí‧ni‧o === Noun === protactínio m (uncountable) protactinium (chemical element) ==== Related terms ==== actinídeo actínio === Further reading === “protactínio”, in Dicionário Aulete Digital (in Portuguese), Rio de Janeiro: Lexikon Editora Digital, 2008–2026 “protactínio”, in Dicionário Priberam da Língua Portuguesa (in Portuguese), Lisbon: Priberam, 2008–2026