Gĭz'zard, n.

n. [Fr. gésier, allied to gosier, throat, from O. Fr. gueuse, geuse, throat; It. gozzo, a bird’s crop.] (Physiol.) An enlarged part of the alimentary canal in birds, having strong muscular walls. It is situated between the glandular part and commencement of the intestine, and performs the function of teeth in grinding or crushing the food.

To fret the gizzard, to harass; to vex one's self, or to be vexed. Hudibras.