Pra′se‐o‐dym″i‐um (?), n. [Praseo- + didymium.] (Chem.) An elementary substance, one of the constituents of didymium; — so called from the green color of its salts. Symbol Ps. Atomic weight 143.6.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.