McDonald's rule

McDonald's rule

 [mik-don´aldz]
the length in centimeters of the abdominal contour from the upper margin of the pubic symphysis to the fundus of the uterus, divided by 3.5, gives the duration of pregnancy in lunar months; applicable only after the sixth month of pregnancy.
References in periodicals archive ?
But in a highly competitive space, where McDonald's rules with a highly focused plan and deep management, Burger King saw that momentum fumble in Q1 when same-store sales slid.