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.
Medical Definition of HALOGEN. : any of the five elements fluorine, chlorine, bromine, iodine, and astatine that form part of group VII A of the periodic table and exist in the free state normally as diatomic molecules.â haÂ·logÂ·eÂ·nous \ha-Ëlaej-ËlÃ¤j-É\ nÉs. adjective any of the five elements fluorine, chlorine, bromine, iodine, and astatine that form part of group VIIA of the periodic table and exist in the free state normally as diatomic molecules. â haÂ·logÂ·eÂ·nous \ha-Ëlae-ËlÃ¤-jÉ\ nÉs. Adjective see halogen defined for. kids