What does ambrosiacus mean in Latin?

ambrosiacus, a adjective, means “ambrosial”.

How do you pronounce ambrosiacus?

In classical Latin, [am.brɔˈsi.a.kʊs]; in ecclesiastical (church) Latin, [am.broˈs̬iː.a.kus].

adjectivefirst/second-declension adjective

ambrosiacus (feminine ambrosiaca, neuter ambrosiacum)

Classical[am.brɔˈsi.a.kʊs]Ecclesiastical[am.broˈs̬iː.a.kus]

singular
form	masculine	feminine	neuter
nominative	ambrosiacus	ambrosiaca	ambrosiacum
genitive	ambrosiacī	ambrosiacae	ambrosiacī
dative	ambrosiacō	ambrosiacae	ambrosiacō
accusative	ambrosiacum	ambrosiacam	ambrosiacum
ablative	ambrosiacō	ambrosiacā	ambrosiacō
vocative	ambrosiace	ambrosiaca	ambrosiacum

plural
form	masculine	feminine	neuter
nominative	ambrosiacī	ambrosiacae	ambrosiaca
genitive	ambrosiacōrum	ambrosiacārum	ambrosiacōrum
dative	ambrosiacīs	ambrosiacīs	ambrosiacīs
accusative	ambrosiacōs	ambrosiacās	ambrosiaca
ablative	ambrosiacīs	ambrosiacīs	ambrosiacīs
vocative	ambrosiacī	ambrosiacae	ambrosiaca

ambrŏsĭăcus, a, um, adj. ambrosia,

I. ambrosial: ambrosiaca vitis, on account of the sweetness of its grapes, Plin. 14, 3, 4, § 40.

From ambrosia (“food of the gods”), from Ancient Greek ἀμβροσία (ambrosía, “of the gods”).