Definition of pyrochlore in English:

pyrochlore

noun

  • A niobium-containing mineral found chiefly in nepheline-syenite and pegmatitic rocks, and occurring as brown or yellowish octahedral crystals which may turn green (or other colours) when strongly heated. Also: any of a group of oxide minerals sharing the cubic (isometric) crystal structure of this mineral and containing niobium, tantalum, or titanium. Frequently attributive, especially in "pyrochlore group".

Origin

Mid 19th century; earliest use found in American Journal of Science. From German Pyrochlor from pyro- + ancient Greek χλωρός greenish-yellow.

Pronunciation

pyrochlore

/ˈpʌɪrə(ʊ)klɔː/