lanthanon

from WordNet (r) 3.0 (2006)

lanthanon
    n 1: any element of the lanthanide series (atomic numbers 57
         through 71) [syn: {rare earth}, {rare-earth element},
         {lanthanoid}, {lanthanide}, {lanthanon}]

from The Collaborative International Dictionary of English v.0.48

lanthanon \lanthanon\ n.
   Same as {lanthanide}.

   Syn: rare earth, rare-earth element, lanthanide.
        [WordNet 1.5]

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