• Webster's Revised Unabridged Dictionary
    • a Chromous Of, pertaining to, or derived from, chromium, when this element has a valence lower than that in chromic compounds.
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Century Dictionary and Cyclopedia
    • chromous Pertaining to, of the nature of, or containing chromium.
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In literature:

In this manner a chromous acetate is obtained perfectly free from zinc.
"Scientific American Supplement, No. 497, July 11, 1885" by Various