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gearhead (GEER-hed) noun A technology enthusiast, e.g. a person with a deep interest in the inner working of computers, automobiles, etc. [From gear, from Middle English gere (equipment) + head, from Middle English, from Old English heafod.] "Pauline and his compatriots were true hard-core gearheads: they loved the oily complexities of machines, and understood the internal mechanics that are, to the rest of us, an inscrutable mesh of wires and servos." Brad Stone; Gearheads; Simon & Schuster, New York; 2003.