Webster's Revised Unabridged Dictionary · 1913

lanthanide

lanthanide , noun

Any rare earth element of the lanthanide series (atomic numbers 57 through 71).

Text from the public-domain GNU Collaborative International Dictionary of English, derived from Webster's Revised Unabridged Dictionary (1913). Definitions marked with were added by later GCIDE contributors and are not in the original 1913 edition.

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