ferruginous

[fuh-roo-juh-nuhs]

fer·ru·gi·nous

[fuh-roo-juh-nuhs]
adjective
1.
Geology. iron-bearing: ferruginous clays.
2.
of the color of iron rust.

Origin:
1655–65; < Latin ferrūginus rust-colored, derivative of ferrūgin-, stem of ferrūgō iron-rust, derivative of ferrum iron; see -ous
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Ferruginous is always a great word to know.
So is permeability. Does it mean:
slow movement of water through the pores in soil or permeable rock
capability of a porous rock or sediment to permit the flow of fluids through its pore spaces
Collins
World English Dictionary
ferruginous (fɛˈruːdʒɪnəs)
 
adj
1.  (of minerals, rocks, etc) containing iron: a ferruginous clay
2.  rust-coloured
 
[C17: from Latin ferrūgineus of a rusty colour, from ferrūgō iron rust, from ferrum iron]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

ferruginous fer·ru·gi·nous (fə-r&oomacr;'jə-nəs, fě-)
adj.

  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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