(anatomy) One of two venous sinuses of the dura mater lying in the posterior two thirds of the concave free inferior margin of the falx cerebri and ending posteriorly by joining the great cerebral vein to form the straight sinus.

(anatomy) One of two venous sinuses of the dura mater passing backward in the convex attached superior margin of the falx cerebri and ending at the internal occipital protuberance by fusion with the transverse sinus.

(anatomy) A small cavity or pocket between the lateral walls of the pharynx on each side and the upper part of the larynx.

(anatomy) Alternative spelling of piriform sinus.

(anatomy) A sinus on each side of the brain that is a continuation of the transverse sinus on the same side, follows an S-shaped course to the jugular foramen, and empties into the internal jugular vein.

(anatomy) Synonym of transverse sinus.

(simile, humorous) Very much single; having no romantic involvement with anybody else.

plural of single-wheeler

(rail transport) A steam locomotive with a single driving axle.

Alternative form of hook, line and sinker