(mineralogy) A hexagonal-ditrigonal dipyramidal colorless mineral containing barium, oxygen, silicon, and zirconium.

The hair of the manes and tails of horses, tails of cattle, and hair of hogs, prepared for use in upholstery. / Used other than figuratively or idiomatically: see curled, hair.

(physics, astronomy) Of a star, specifically its equator: darker due to gravity darkening.

plural of biotrack