Heat excited by friction. / Injury or wear caused by friction. / Vexation; irritation of mind; rage. / (archaic) An expression of opinionated conflict.

(mining) The zone, parallel to the walls of a vein, in which the ore is concentrated, or any narrow streak of paying ore in less valuable material.

(slang, vulgar, US, Canada, derogatory) obnoxiously inconsiderate or objectionable

The act of seeking and finding shapes in clouds.