Etymology
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americium (n.)

artificial radioactive element, 1946, from America + metallic element ending -ium.

updated on April 19, 2018

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Definitions of americium from WordNet

americium (n.)
a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms;
Synonyms: Am / atomic number "
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.