- Geology. iron-bearing: ferruginous clays.
- of the color of iron rust.
Origin of ferruginous
1655–65; < Latin ferrūginus rust-colored, derivative of ferrūgin-, stem of ferrūgō iron-rust, derivative of ferrum iron; see -ous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for ferruginous
There are sandstones, shales, and grits, with ferruginous joints.British Borneo
W. H. Treacher
The body is dusky indigo blue; the tail and abdomen are ferruginous.Birds of the Indian Hills
The hind wings on this side are ferruginous, mottled with purple.
The hind wings are ferruginous on the under side, mottled with yellow.
On the under side the fore wings are fulvous, tipped with ferruginous.
- (of minerals, rocks, etc) containing irona ferruginous clay
C17: from Latin ferrūgineus of a rusty colour, from ferrūgō iron rust, from 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
- Associated with or containing iron.
- Having the color of iron rust; reddish-brown.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.