Definition of ECG noun from the Oxford Advanced Learner's Dictionary

 

ECG

 noun
noun
BrE BrE//ˌiː siː ˈdʒiː//
 
; NAmE NAmE//ˌiː siː ˈdʒiː//
 
(North American English also EKG)
 
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the abbreviation for ‘electrocardiogram’ (a medical test that measures and records electrical activity of the heart)
See the Oxford Advanced American Dictionary entry: ECG