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Will Matter United States Local time: 21:10 Native speaker of: English PRO pts in pair: 32
Thank you both!
7 hrs confidence: peer agreement (net): +1
Explanation: Just an addition to Wilmatter's answer: if this is in the context of an X-ray or scan, it means "glow" on the image.
I've never heard halo effect in the sense of referred pain. I've only heard it used in the context of photography.