primiˈgenian,a.rare. Also 7 erron.primo-. [f. as prec. + -an.] =prec. 1650Ashmole Chym. Collect. 55 Even as the heat of Animals [is hidden] in the Primogenian moisture.1847Whewell Hist. Induct. Sc. (ed. 2) III. 694 The primigenian elephant or mammoth.