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variant of ferri-: ferroconcrete. In chemical terminology, the meanings of ferri- and ferro- are specialized to correspond to ferric and ferrous.
Origin of ferro-
< Latin ferr(um) iron + -o- Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for ferro-


combining form
indicating a property of iron or the presence of iron: ferromagnetism, ferromanganese
indicating the presence of iron in the divalent state: ferrocyanide Compare ferri-
Word Origin
from Latin ferrum iron
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for ferro-

before vowels ferr-, word-forming element indicating the presence of iron, from Latin ferro-, comb. form of ferrum "iron," possibly of Semitic origin, via Etruscan [Klein].

Online Etymology Dictionary, © 2010 Douglas Harper
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ferro- in Medicine

ferro- or ferr-

  1. Iron: ferrokinetics.

  2. Ferrous iron: ferroprotein.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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