From The Collaborative International Dictionary of English v.0.48 [gcide]:
1. A straight and slender stick; a wand; hence, any slender bar, as of wood or metal (applied to various purposes). Specifically: (a) An instrument of punishment or correction; figuratively, chastisement.
He that spareth his rod hateth his son. --Prov. xiii. 24. (b) A kind of sceptor, or badge of office; hence, figuratively, power; authority; tyranny; oppression. "The rod, and bird of peace." --Shak. (c) A support for a fishing line; a fish pole. --Gay. (d) (Mach. & Structure) A member used in tension, as for sustaining a suspended weight, or in tension and compression, as for transmitting reciprocating motion, etc.; a connecting bar. (e) An instrument for measuring.
From WordNet (r) 3.0 (2006) [wn]:
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