1. variant of ferri-: ferroconcrete. In chemical terminology, the meanings of ferri- and ferro- are specialized to correspond to ferric and ferrous.

combining form

  1. indicating a property of iron or the presence of ironferromagnetism; ferromanganese
  2. indicating the presence of iron in the divalent stateferrocyanide Compare ferri-

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].


  1. Iron:ferrokinetics.
  2. Ferrous iron:ferroprotein.

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