S / strix
noun

strix

gen. strĭgis · gender feminine · decl. 3rd
a furrow; channel; groove
a furrow, channel, groove, flute, Vitr. 3, 3 fin.: strigium circuitus, id. 4, 1 med.; 4, 3; 4, 4 (al. striae; but cf. strigatus and strigo).