First

{of labor), that stage in which the molding of the fetal head and the dilatation of the cervix are affected. S., Hot, the febrile S. of a malarial paroxysm. S. of Invasion, the period in the course of a disease in which the system comes under the influence of the morbific agent. S. of Latency, the incubation-period of an infectious disease, or that period intervening between the entrance of the virus and the manifestations of the symptoms to which.it gives rise. S., ch674.xhtml p 597