short for rod cell, a rod-shaped cell in the eye that is sensitive to light.

listen to the pronunciation of short for rod cell, a rod-shaped cell in the eye that is sensitive to light.
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Определение short for rod cell, a rod-shaped cell in the eye that is sensitive to light. в Английский Язык Английский Язык словарь

Short for rod cell, a rod-shaped cell in the eye that is sensitive to light.
rod

The rods are more sensitive than the cones, but do not discern color.