Real Dictionary

ballottement in American English
a technique for palpating internal organs, tumors, etc., as to check for pregnancy or a floating kidney
noun: a physical diagnostic technique used to detect solid objects surrounded by fluid, as abdominal organs or tumors, performed by suddenly compressing the fluid with the hand, causing the solid object to abut against the hand

ballottement in British English
noun: a technique of feeling for a movable object in the body, esp confirmation of pregnancy by feeling the rebound of the fetus following a quick digital tap on the wall of the uterus