(n)pressure applied anywhere to a body of fluid causes a force to be transmitted equally in all directions; the force acts at right angles to any surface in contact with the fluid, Syn.Pascal's law of fluid pressures
(n)relatively weak attraction between neutral atoms and molecules arising from polarization induced in each particle by the presence of other particles
{ oror } [ After Fernand Widal (b. 1862), French physician. ] (Med.) A test for typhoid fever based on the fact that blood serum of one affected, in a bouillon culture of typhoid bacilli, causes the bacilli to agglutinate and lose their motility. [ Webster 1913 Suppl. ]