Rotating image of human brain, illustrating the lateral sulcus in the brain. The term sulcus (pl. sulci) is a general descriptive term for a furrow or fissure.
Halo may refer to: 1  Halo (religious iconography), a glow or ring of light around a head or person in art. 2  Halo (series), video game franchise.
halo sign. Type:Term. Definitions. 1. elevation of the subcutaneous fat layer over the fetal skull in a dead or dying fetus; said to be the most common radiologic sign of fetal death.