1903 T. W. Richards & W. N. Stull 43 The pressure of a megadyne per square centimeter would be called a megabar.
1925 J. Joly iii. 55 The megabar is one million dynes per sq. cm. It is nearly one atmosphere.
1991 May 22/1 By measuring the diffraction of the X-rays, they calculated that the pressure being put on the samples was 4.16 megabars.