adjective Chemistry.
of or containing iron, especially in the bivalent state.

1860–65; < Latin ferr(um) iron + -ous

preferrous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ferrous (ˈfɛrəs)
of or containing iron in the divalent state; designating an iron (II) compound
[C19: from ferri- + -ous]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1865, from L. ferreus "made of iron," from ferrum "iron."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ferrous fer·rous (fěr'əs)
Of, relating to, or containing iron, especially with a valence of 2 or a valence lower than in a corresponding ferric compound.

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
ferrous   (fěr'əs)  Pronunciation Key 
Containing iron, especially iron with a valence of 2. Compare ferric.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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