Pur‐pu″re‐o– (?). A combining form signifying of a purple or purple-red color. Specif. (Chem.), used in designating certain brilliant purple-red compounds of cobaltic chloride and ammonia, similar to the roseocobaltic compounds. See Cobaltic.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.