Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. omnĭgĕnus, a, um, adj. [omnis-genus], of all kinds (poet. and in post-class. prose): omnigenūmque deūm monstra, Verg. A. 8, 698: omnigenūm genitor deūm, Mart. Cap. 9, § 912: doctrinae, Gell. 14, 6, 1 (but in Lucr. 2, 759; 821 al. Lachm. reads omne genus).
2. omnĭgĕnus, a, um, adj. [omnisgigno], all-begetting, all-producing (postclass.): Pater, Prud. ap. Symm. 1, 12.