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

1860–65; < Latin ferr(um) iron + -ous

preferrous, adjective
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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
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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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Example sentences
With the greenish, crystalline look of a pulverized windshield, ferrous sulfate is commonly given to iron-deficient humans.
No, that's how you can show that magnets can affect non-ferrous metals in a way that's easy to measure.
In ferrous castings the effect is similar to quenching metals in forge work.
Ferrous iron is better absorbed and is the preferred form of iron tablets.
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