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thulium

(t̸ho̵̅o̅′lē əm, t̸hyo̵̅o̅′-)

noun

a bright, silvery chemical element, one of the rare-earth elements: symbol, Tm; at. no., 69

Origin: ModL: so named (1886) by L. de Boisbaudran (see gadolinium) < thulia (from which it was isolated by Cleve in 1879) + -ium

See thulium in American Heritage Dictionary 4

noun Symbol Tm

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.

Origin:

Origin: After Thule¹

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