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Answer for the clue "Any element of the lanthanide series (atomic numbers 57 through 71) ", 10 letters:
lanthanoid

Word definitions for lanthanoid in dictionaries

WordNet Word definitions in WordNet
n. any element of the lanthanide series (atomic numbers 57 through 71) [syn: rare earth , rare-earth element , lanthanide , lanthanon ]

Wiktionary Word definitions in Wiktionary
n. (context inorganic chemistry English) lanthanide