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n. A bright, silvery rare-earth element obtained commercially from monazite, having an x-ray emitting isotope that is used in small portable medical x-ray units. Atomic number 69; atomic weight 168.934; melting point 1,545°C; boiling point 1,727°C; specific gravity 9.3; valence 2, 3. See Table at element.

n. a metallic chemical element (symbol Tm) with an atomic number of 69.

n. A rare metallic element of uncertain properties and identity, said to have been found in the mineral gadolinite.

n. The name was given in 1879, by Cleve, to a supposed new element present in the compounds of Mosandu' s erbium extracted from gadolinite. The evidence of its existence was found in an examination of the absorption-spectra of products of the fractionation of erbium salt solutions, but it is very doubtful whether the separation is complete and whether thulium is to be considered as a distinct and single element.

n. A supposed element found in the mineral gadolinite. Its properties have not been ascertained, and its existence is doubtful.

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

"China accounts for 95 percent of global production and about 60 percent of consumption of rare metals, including dysprosium, terbium, thulium, lutetium and yttrium, according to the U.S."

metallic element    metal   

thulite    Thule   

thulia    thulium oxide   

holmium    hydro-    cerium    diallyl    tetragonal    diisopropyl    cadmium    phenyl    carbonyl    dimethyl