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.
AÂ·polÂ·lo. n. 1. Greek Mythology The god of prophecy, music, medicine, and poetry, sometimes identified with the sun. 2. apollo pl. apolÂ·los A young man of great physical beauty.