anatomy Any of the narrow grooves in an organ or tissue especially those that mark the convolutions on the surface of the brain.

Roget 259: furrow, groove, rut, sulcus [Anat.], scratch, streak, striae, crack, score, incision, slit; chamfer, fluting; corduroy road, cradle hole.    channel, gutter, trench, ditch, dike, dyke; moat, fosse^†, trough, kennel; ravine etc. (interval) 198; tajo [U.S.], thank-ye-ma'am [U.S.].    ... show more