A lesbian, particularly one who appears masculine or acts in a masculine manner. This word has been reclaimed, by some, as politically empowering. (See usage notes.)
A long mass of eruptive rock, a dyke (vein) may consist of mineral deposits located between other rocks
narrow body of igneous rock cutting across structure of the adjacent country rocks
a vertical (up and down) run of molten rock that has cooled and become solid These are normally found through layers of rock
A tabular, near vertical, minor igneous intrusion that cuts across horizontal to gently dipping planar structures in the host rock