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rod (rod) a straight, slim mass of substance. one of two types of visual cells in the retina; rods are cylindrical in shape and contain rhodopsin. Together with the cones they form the light-sensitive elements of the eye. See also eye and vision. Called also retinal rod. Corti rods
pillar cells. Harrington rod
a rigid contoured metal rod used in Harrington instrumentation. olfactory rod
the slender apical portion of an olfactory bipolar neuron, a modified dendrite extending to the surface of the epithelium. retinal rod
rod (def. 2).
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