What is "ytterbium oxide"

n. (context inorganic compound English) Any oxide of ytterbium, but especially the colourless solid Yb₂O₃ (itterbia or ytterbia)

Ytterbium(III) oxide is the chemical compound with the formula YbO. It is one of the more commonly encountered compounds of ytterbium. It has the "rare-earth C-type sesquioxide" structure which is related to the fluorite structure with one quarter of the anions removed, leading to ytterbium atoms in two different six coordinate (non-octahedral) environments.