Gallstone

[Sarah]

A concretion, or calculus, formed in the gall bladder orbiliary passages. See Calculus, n., 1.

[Sarah]

A) A hefty rock shot out of the pipes
B) The toilet pistol hardpoint ammo
C) The Log-Breaking Arial Torpedo
D) A crystalline structure that seems to grow in your bladder and is either passed through the penis OR blasted with ultrasound to prevent massive pain

[Becky]

a small piece of hard material that sometimes forms in the gall bladder (= an organ in the body) and can cause great pain