Prĭ-mĭ-gĕ'nĭ-oŭs or Prĭ-mĭg'e-noŭs, a.

a. [Lat. primigenus, from primus, first, and genere, gignere, to beget; Fr. primigène. Cf. supra.] First formed or generated; original; as, semi-primigenous strata. [Obs.] Kirwan.