magnetite

[mag-ni-tahyt] Origin

mag·net·ite

[mag-ni-tahyt]
noun
a very common black iron oxide mineral, Fe3O4, that is strongly attracted by magnets: an important iron ore.

Origin:
1850–55; magnet + -ite1; compare German Magnetit
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Magnetite is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Collins
World English Dictionary
magnetite (ˈmæɡnɪˌtaɪt)
 
n
a black magnetic mineral, found in igneous and metamorphic rocks and as a separate deposit. It is a source of iron. Composition: iron oxide. Formula: Fe3O4. Crystal structure: cubic
 
magnetitic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

magnetite
1851, from Ger. magnetit (1845); see magnet.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
magnetite   (māg'nĭ-tīt')  Pronunciation Key 
A brown to black mineral that is strongly magnetic. It crystallizes in the cubic system and commonly occurs as small octahedrons. Magnetite occurs in many different types of rock and is an important source of iron. Chemical formula: Fe3O4.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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