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.

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

plural of biotrack

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