halo is a topic covered in the Taber's Medical Dictionary.

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[Gr. halōs, threshing floor, disk (of the sun or moon, shield, halo]

1. The areola, esp. of the nipple.
2. A ring surrounding the macula lutea in ophthalmoscopic images.
3. A circle of light surrounding a shining body.
4. A ring of depigmented skin surrounding a nevus.

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