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

1790–1800; < Latin ferr(um) iron + -ic

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World English Dictionary
ferric (ˈfɛrɪk)
of or containing iron in the trivalent state: ferric oxide; designating an iron (III) compound
[C18: from Latin ferrum iron]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

ferric fer·ric (fěr'ĭk)
Of, relating to, or containing iron, especially with a valence of 3 or a valence higher than in a corresponding ferrous 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
ferric   (fěr'ĭk)  Pronunciation Key 
Containing iron, especially iron with a valence of 3. Compare ferrous.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In order to live and grow they oxidise dissolved iron in the water, producing ferric oxide.
There are two forms of supplemental iron: ferrous and ferric.
Citrine has ferric impurities, and is rarely found naturally.
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