A record of the retinal action currents produced in the retina by an adequate light stimulus. [electro- + retina + G. gramma, something written]
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elec·tro·ret·i·no·gram -'ret-ən-ə-.gram n a graphic record of electrical activity of the retina used esp. in the diagnosis of retinal conditions
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elec·tro·ret·i·no·gram (e-lek″tro-retґĭ-no-gram) the record obtained by electroretinography; abbreviated ERG.Medical dictionary. 2011.