ˈ ̷ ̷ ̷ ̷ˌkrās, -āz noun
( -s )
Etymology: German polykras, from poly- + -kras (from Greek krasis mixing, combination) — more at krasis
: a mineral (Y,Ca,Ce,U,Th)(Ti,Cb,Ta) 2 O 6 consisting of a columbate and titanate of the metals of the yttrium group that is isomorphous with euxenite (hardness 5-6, specific gravity 5)