Etymology
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ferrous (adj.)

"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. Contrasted with ferric.

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Definitions of ferrous

ferrous (adj.)
of or relating to or containing iron;
Synonyms: ferric
From wordnet.princeton.edu