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õhu toimel tumenev pehme hõbevalge metall, omadustelt haruldane muldmetall (lantanoid), keemiline element järjenumbriga 57
lantaan . EKI Combined Dictionary 2026. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif/est/eki/lantaan/1/est (23.09.2026)
Uusladina lanthanum < kreeka lanthanein 'peidus olema, peituma'.
Inflection Type 22e