thulium /thu·li·um/ (thoo´le-um) chemical element, at. no. 69, symbol Tm.
thulium (Tm)
thu·li·um (th  l - m)n. Symbol Tm A rare-earth element having an x-ray emitting isotope that is used in small portable medical x-ray units. Atomic number 69. |
thulium (Tm)
[tho̅o̅′lē·əm]
Etymology: L, Thule, northern island
a rare earth metallic element. Its atomic number is 69, and its atomic mass is 168.93. Thulium that has been irradiated in a nuclear reactor gives off gamma radiation.
thulium
a chemical element, atomic number 69, atomic weight 168.934, symbol Tm. See Table 6.
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