THULIUM

thulium, Tm, atomic number

(noun) 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

Source: WordNet® 3.1

Etymology

Noun

thulium (uncountable)

A metallic chemical element (symbol Tm) with atomic number 69: a fairly soft, easily workable metal with a bright silvery-gray lustre.

Source: Wiktionary

Thu"li*um, n. Etym: [NL. See Thule.] (Chem.)

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

Source: Webster’s Unabridged Dictionary 1913 Edition

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