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Noun1.lanthanon - any element of the lanthanide series (atomic numbers 57 through 71)
group, grouping - any number of entities (members) considered as a unit
terbium metal - a separate group of related lanthanides, including terbium, europium, gadolinium, and sometimes dysprosium
References in periodicals archive ?
An account by Seaborg of how he proposed (against strong opposition) that elements 90 to 92 represented the start of an analogous series to the lanthanons.