(mineralogy) A monoclinic-sphenoidal mineral containing aluminum, calcium, hydrogen, iron, magnesium, manganese, oxygen, and phosphorus.

(inorganic chemistry) Any of several non-stoichiometric compounds, of general formula XYCuₘOₙ, many of which are superconductors. / (organic chemistry) Any organocopper compound of general formula ...

plural of thirlage

simple past tense and past participle of rive