[ fer-uh s ]
/ ˈfɛr əs /

adjective Chemistry.

of or containing iron, especially in the bivalent state.

Origin of ferrous

1860–65; < Latin ferr(um) iron + -ous

Related forms

pre·fer·rous, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for ferrous

British Dictionary definitions for ferrous


/ (ˈfɛrəs) /


of or containing iron in the divalent state; designating an iron (II) compound

Word Origin for ferrous

C19: from ferri- + -ous
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

Medicine definitions for ferrous


[ fĕrəs ]


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.

Science definitions for ferrous


[ fĕrəs ]

Containing iron, especially iron with a valence of 2. Compare ferric.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.