[ef.fu.sion] n (15c) 1: an act of effusing
2: unrestrained expression of words or feelings "greeted her with great ~ --Olive H. Prouty" 3 a (1): the escape of a fluid from anatomical vessels by rupture or exudation (2): the flow of a gas through an aperture whose diameter is small as compared with the distance between the molecules of the gas b: the fluid that escapes