| 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) |