Lewis & Short

rēgĭ-fĭcus, a, um, adj. [rex-facio], kingly, royal, regal, i. q. magnificent, sumptuous (poet.): epulae paratae Regifico luxu, Verg. A. 6, 605; cf.: mensae paratu Regifico, Val. Fl. 2, 652; Ambros. Virg. 3, 6, § 27.
Adv.: rēgĭfĭcē, royally, splendidly, magnificently, sumptuously: instructa domus, Enn. ap. Cic. Tusc. 3, 19, 44 (Trag. v. 122 Vahl.): exstructae mensae, Sil. 11, 273.