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[fuh-roo-juh-nuh s] /fəˈru dʒə nəs/
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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for ferruginous
Historical Examples
  • On gaining more open ground, the country gradually rose before us, and a ferruginous conglomerate cropped out in places.

  • On the under side the fore wings are fulvous, tipped with ferruginous.

    The Butterfly Book William Jacob Holland
  • The hind wing is deeply mottled with ferruginous, on which the lighter white markings stand forth very conspicuously.

    The Butterfly Book William Jacob Holland
  • The hind wings on this side are ferruginous, mottled with purple.

    The Butterfly Book William Jacob Holland
  • The boulders were all weathered a bright red and were much pitted where ferruginous minerals were leached out.

    The Home of the Blizzard Douglas Mawson
  • There was also in the garden a mineral spring of a ferruginous quality.

    Travels Through North America, v. 1-2 Berhard Saxe-Weimar Eisenach
  • There are sandstones, shales, and grits, with ferruginous joints.

    British Borneo W. H. Treacher
  • Ferrugineous, or ferruginous, resembling iron-rust; red-grayish.

  • There exist in the park at Passy three ferruginous springs, the waters of which were famous even in the seventeenth century.

  • Everywhere was the same blackened, cooling, ferruginous slag.

British Dictionary definitions for ferruginous


(of minerals, rocks, etc) containing iron: a ferruginous clay
Word Origin
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
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ferruginous in Medicine

ferruginous fer·ru·gi·nous (fə-rōō'jə-nəs, fě-)

  1. Associated with or containing iron.

  2. 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.
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