noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The chemical element (symbol Am) with an atomic number of 95. uncountable, usually
2. 2
   a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms wordnet

Synonyms

All synonyms

amatomic number 95elementgoldironlead

Example

More examples

"Even thin sheets of Americium-241 can sustain a chain reaction."

Etymology

From Americ(as) + -ium, by analogy with europium.

Related phrases

americium bromideamericium chlorideamericium dioxideamericium fluorideamericium iodideatomic number

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.