(n) a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime, Syn.atomic number 69, Tm
‖prop. n. [ L. Thule, Thyle, Gr. Qoy`lh, Qy`lh. ] The name given by ancient geographers to the northernmost part of the habitable world. According to some, this land was Norway, according to others, Iceland, or more probably Mainland, the largest of the Shetland islands; hence, the Latin phrase ultima Thule, farthest Thule. [ 1913 Webster ]
n. [ NL. See Thule. ] (Chem.) A rare metallic element of the lanthanide group having atomic number 69, and atomic weight 168.93. It is found in the mineral gadolinite and other minerals, together with other rare earths. For more information see the data from ChemGlobe. [ 1913 Webster + PJC ]
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