- of or containing iron, especially in the bivalent state.
Origin of ferrous
1860–65; < Latin ferr(um) iron + -ous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for ferrous
Invariably there is among these a formula for ferrous oxalate developer.Bromide Printing and Enlarging
John A. Tennant
That a minute quantity of iron is dissolved by the carbonic acid contained in the water, ferrous bicarbonate being formed.
Calculate the value of the ferrous salt in terms of bichromate.Soap-Making Manual
E. G. Thomssen
To obtain these the gold is first precipitated from the solution by ferrous chloride, all the other metals by iron turnings.
Fig. 121 shows us, also, what are the conditions under which the reduction of ferric to ferrous oxide by carbon can occur.The Phase Rule and Its Applications
- of or containing iron in the divalent state; designating an iron (II) compound
C19: from ferri- + -ous
Word Origin and History for ferrous
"pertaining to or containing iron," 1865, from Latin ferreus "made of iron," from ferrum "iron" (see ferro-). In chemistry, "containing iron," especially with a valence of two.
Online Etymology Dictionary, © 2010 Douglas Harper
- Of, relating to, or containing iron, especially with a valence of 2 or a valence lower than in a corresponding ferric compound.
- 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.