Hypertext Webster Gateway: "Sulcus"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Sulcus \Sul"cus\, n.; pl. {Sulci}. [L., a furrow.]
A furrow; a groove; a fissure.
From WordNet (r) 1.7 (wn)
sulcus
n : (anatomy) any of the narrow grooves in an organ or tissue
especially those that mark the convolutions on the
surface of the brain
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