砂囊

砂囊	shā náng	gizzard (anatomy of birds, gastropods etc)
砂	shā	sand / gravel / granule / variant of 沙
囊	nāng	used in 囊膪 and 囊揣 / used in 鼓鼓囊囊
囊	náng	sack / purse / pocket (for money)