deadcenter

dead center

noun Machinery.
1.
Also called dead point. (in a reciprocating engine) either of two positions at which the crank cannot be turned by the connecting rod, occurring at each end of a stroke when the crank and connecting rod are in the same line.
2.
See under center ( def 19a ).

Origin:
1870–75

dead-center, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

center
late 14c., from O.Fr. centre, from L. centrum "center," orig. fixed point of the two points of a compass, from Gk. kentron "sharp point, goad," from kentein "stitch," from PIE base *kent- "to prick" (cf. Breton kentr "a spur," O.H.G. hantag "sharp, pointed"). The verb is from 1620s. Spelling with -re
popularized in Britain by Johnson's dictionary, though -er is older. Center of gravity is recorded from 1650s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

center cen·ter (sěn'tər)
n.

  1. A point or place in the body that is equally distant from its sides or outer boundaries; the middle.

  2. A group of neurons in the central nervous system that control a particular function.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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