Eccentric 1 : (1) Displaced with respect to a centre, not concentric. (2) A crank in which the pin diameter is so much greater than the offset (throw) that the result is a drum or disc mounted eccentrically on the shaft
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}