[noo-klahyd, nyoo-]
noun Physics.
an atomic species in which the atoms all have the same atomic number and mass number.
an individual atom in such a species.

1945–50; nucl(eo)- + -ide < Greek eîdos shape Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nuclide (ˈnjuːklaɪd)
See also isotope a species of atom characterized by its atomic number and its mass number
[C20: from nucleo- + -ide, from Greek eidos shape]

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American Heritage
Medical Dictionary

nuclide nu·clide (nōō'klīd', nyōō'-)
A type of atom specified by its atomic number, atomic mass, and energy state, such as carbon 14.

nu·clid'ic (nōō-klĭd'ĭk, nyōō-) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
nuclide   (n'klīd')  Pronunciation Key 
An atomic nucleus identified by its atomic element and its mass number. For example, a carbon-14 nuclide is the nucleus of a carbon atom, which has six protons, with mass number 14 (thus having eight neutrons). See also isotope.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Nuclide: a general term applicable to all atomic forms of an element.
Each box represents a particular nuclide and is color-coded according to its predominant decay mode.
Nuclide a general term applicable to all atomic forms of an element.
Iodine reacts easily with other chemicals, and isotopes of iodine are found as compounds rather than as a pure elemental nuclide.
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