Search Result for "sulcus": 
Wordnet 3.0

NOUN (1)

1. (anatomy) any of the narrow grooves in an organ or tissue especially those that mark the convolutions on the surface of the brain; 



The Collaborative International Dictionary of English v.0.48:

Sulcus \Sul"cus\, n.; pl. Sulci. [L., a furrow.]
   A furrow; a groove; a fissure.
   [1913 Webster]


WordNet (r) 3.0 (2006):

sulcus
    n 1: (anatomy) any of the narrow grooves in an organ or tissue
         especially those that mark the convolutions on the surface
         of the brain