(mineralogy) A tetragonal-ditetragonal dipyramidal mineral containing barium, calcium, chlorine, fluorine, hydrogen, manganese, oxygen, silicon, and titanium.

present participle of caliper

(chiefly music, language learning) To play (an instrument) or sing or to learn music without reading or memorizing sheet music; to learn a language without instruction. / To do by guessing, to impr...

(Scotland) purposeful