† progˈnosticant,ppl.a.Obs.rare—1. [ad.med.L. prognōsticānt-em, pr.pple. of prognōsticāre to prognosticate: see -ant1.] Prognosticating, foreshowing. 1619Bp. J. King Serm. 11 Apr. 52 As significant, and prognosticant of the wrath of God as any of these wonders.