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radioactive

 - 6 dictionary results
MP Radiochemicals
Supplier of Radioactive Compounds for Bio Research Applications
www.mpbio.com

ra⋅di⋅o⋅ac⋅tive

  [rey-dee-oh-ak-tiv]
Use radioactive in a Sentence
–adjective Physics, Chemistry.
of, pertaining to, exhibiting, or caused by radioactivity.
Origin:
1895–1900; radio- + active

Related forms:
ra⋅di⋅o⋅ac⋅tive⋅ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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MP Radiochemicals
Supplier of Radioactive Compounds for Bio Research Applications
www.mpbio.com
ra·di·o·ac·tive   (rā'dē-ō-āk'tĭv)   
adj.  

  1. Of, exhibiting, or caused by radioactivity.

  2. Informal Extremely sensitive or controversial: "Perhaps race is now too radioactive a topic, in an era of political correctness" (David Nyhan).

ra'di·o·ac'tive·ly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Cultural Dictionary

radioactive

A descriptive term for a material made up of atoms in which radioactivity occurs.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

radioactive 
1898, from Fr. radio-actif, coined by Pierre and Marie Curie from radio-, comb. form of L. radius (see radiation) + actif (fem. active) "active."
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: ra·dio·ac·tive
Pronunciation: "rAd-E-O-'ak-tiv
Function: adjective
: of, caused by, or exhibiting radioactivity<radioactive isotopes> —ra·dio·ac·tive·ly adverb
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

radioactive ra·di·o·ac·tive (rā'dē-ō-āk'tĭv)
adj.
Of or exhibiting radioactivity.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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