(adjective) : antĕ-lūcānus, a, um, lux
* Before light, before day (class.; only in prose): ex antelucano tempore,Cic. Fam. 15, 4: gutta roris antelucani,Vulg. Sap. 11, 23: industria,Cic. Tusc. 4, 19, 44: cenae,which continue the whole night until daybreak,id. Cat. 2, 10: lucubratio,Col. 11, 2, 55: spiritus, i. e. ventus,Vitr. 1, 6; so, aurae,Plin. 18, 6, 7, § 2.—Hence, subst.: antĕlūcā-num, i, n., the dawn (eccl. Lat.): doctrinam quasi antelucanum illumino omnibus, I make to shine as the dawn, * Vulg. Eccli. 24, 44.

s. TLL