SULCUS
sulcus
(noun) (anatomy) any of the narrow grooves in an organ or tissue especially those that mark the convolutions on the surface of the brain
Source: WordNet® 3.1
Etymology
Noun
sulcus (plural sulci)
(anatomy) A furrow or groove in an organ or a tissue.
(anatomy) Any of the grooves that mark the convolutions of the surface of the brain.
Synonym: fissure
(planetology) A region of subparallel grooves or ditches formed by a geological process.
Coordinate terms
• gyrus
Source: Wiktionary
Sul"cus, n.; pl. Sulci. Etym: [L., a furrow.]
Definition: A furrow; a groove; a fissure.
Source: Webster’s Unabridged Dictionary 1913 Edition