Webster's English Dictionary

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sulcus

sul.cus \'s*l-k*s\ \-.ki-, -.ke-\ n or sul.ci [L; akin to OE sulh plow, Gk 
   holkos furrow, helkein to pull] pl  : FURROW, GROOVE; esp : a shallow 
   furrow on the surfac e of the brain separating adjacent convolutions