| halo sign | <radiology> Narrow, radiolucent ring surrounding breast lesion, indicates benign tumour, rare exceptions: intracystic carcinoma, papillary carcinoma, carcinoma arising in fibroadenoma (12 Dec 1998) |
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| halo sign of hydrops | A discredited roentgenographic sign of foetal hydrops caused by scalp oedema so that a definite corona surrounds the skull. (05 Mar 2000) |
| halo traction | Application of skeletal traction to the head by means of a halo device. (05 Mar 2000) |
| halo vision | A condition in which coloured or luminous rings are seen around lights. (05 Mar 2000) |
| senile halo | Circumpapillary halo seen in choroidal atrophy of the aged. (05 Mar 2000) |