‖La‐vœ″si‐um (?), n. [NL., fr. Lavoisier, the celebrated French chemist.] (Chem.) A supposed new metallic element. It is said to have been discovered in pyrites, and some other minerals, and to be of a silver-white color, and malleable.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.