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Definition of rod
- 3 historical, chiefly Britishanother term for perch3 (sense 1).
- (also square rod)another term for perch3 (sense 2).
- 5 Anatomy a light-sensitive cell of one of the two types present in large numbers in the retina of the eye, responsible mainly for monochrome vision in poor light. Compare with cone (sense 3 of the noun).
- see kiss.
late Old English rodd 'slender shoot growing on or cut from a tree', also 'straight stick or bundle of twigs used to inflict punishment'; probably related to Old Norse rudda 'club'