Dys‐pro″si‐um (?), n. [NL., fr. Gr. δυσπρόσιτοσ hard to get at.] (Chem.) An element of the rare earth-group. Symbol Dy; at. wt., 162.5.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.