plural of sit-upon / (UK, slang, obsolete) Trousers.

(architecture) A roofed, open gallery, usually on an upper level.

(biochemistry) The chemical basis of cartilage, converted by long boiling in water into a gelatinous substance called chondrin.

A rocket engine. / (military) A non-guided missile propelled by a rocket engine. / A vehicle propelled by a rocket engine. / A rocket propelled firework; a skyrocket. / (slang) An ace (the playing ...