1-Stop Dictionary Reference

Americium

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The American Heritage® Dictionary of the English Language, 4th Edition

n. A white metallic transuranic element of the actinide series, having isotopes with mass numbers from 237 to 246 and half-lives from 25 minutes to 7,950 years. Its longest-lived isotopes, Am 241 and Am 243, are alpha-ray emitters used as radiation sources in research. Atomic number 95; specific gravity 11.7; valence 3, 4, 5, 6. See Table at element.

Wiktionary, Creative Commons Attribution/Share-Alike License

n. The chemical element (symbol Am) with an atomic number of 95.

WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

n. a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms

Word Usage

"Barot wrote a letter to the leaders of al-Qaeda proposing that he would mine the small amount of radioactive material known as americium that can be found in ordinary smoke detectors and use it to build a radiological device."

Hypernym

Words that are more generic or abstract

metallic element metal

Form

americium chloride americium fluoride americium bromide americium iodide americium dioxide

Same Context

Words that are found in similar contexts

terbium neptunium micelle botulism upacoera