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lithium (n.)

silver-white metallic element, 1818, with element ending -ium + lithia, Modern Latin name given by Swedish chemist Jöns Jacob Berzelius (1779-1848) to the earth from which it was extracted, from Greek lithos "stone" (see litho-). The name indicates its mineral origin and distinguishes it from two previously known alkalis of vegetable origin.

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Definitions of lithium from WordNet

lithium (n.)
a soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals;
Synonyms: Li / atomic number "
From wordnet.princeton.edu