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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 ?
During the first half of 2006, the price of rare earth increased dramatically as well as the total export, particularly for the strategic lanthanon such as terbia, dysprosium oxide, neodymium oxide, neodymium and terbium, etc.
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.