Tm — synonyms, definition

1. Tm (Noun)

2 synonyms
atomic number 69 thulium
1 definition

Tm (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.

2 types of
metal metallic element
3 parts of
apatite monazite xenotime