What does "thulium" mean?

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

What is a synonym for "thulium"?

Common synonyms include: activator, atomic number 69, chemical element, dopant, gold, iron.

/ˈθjuːliəm/ noun

noun ·Rare ·Advanced level

Noun

1
A metallic chemical element (symbol Tm) with atomic number 69: a fairly soft, easily workable metal with a bright silvery-gray lustre. uncountable
2
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 wordnet

From Thule (a poetic name for Scandinavia) + -ium.