n. A small lance or javelin.n. A small surgical instrument, sharp-pointed and generally two-edged, used in bloodletting and in opening tumors, abscesses, etc.n. In arch., a lancet-window; an arch of lancet shape.n. In entomology, one of the lower pair of piercing organs in the dipterous mouth; the scalpella: supposed by Kirby and Spence to represent the maxillæ of the haustellate mouth.