What does haeresiacus mean in Latin?

haeresiacus, a adjective, means “heretical”.

How do you pronounce haeresiacus?

In classical Latin, [hae̯.rɛˈsi.a.kʊs]; in ecclesiastical (church) Latin, [e.reˈs̬iː.a.kus].

adjectivefirst/second-declension adjective

haeresiacus (feminine haeresiaca, neuter haeresiacum)

Classical[hae̯.rɛˈsi.a.kʊs]Ecclesiastical[e.reˈs̬iː.a.kus]

singular
form	masculine	feminine	neuter
nominative	haeresiacus	haeresiaca	haeresiacum
genitive	haeresiacī	haeresiacae	haeresiacī
dative	haeresiacō	haeresiacae	haeresiacō
accusative	haeresiacum	haeresiacam	haeresiacum
ablative	haeresiacō	haeresiacā	haeresiacō
vocative	haeresiace	haeresiaca	haeresiacum

plural
form	masculine	feminine	neuter
nominative	haeresiacī	haeresiacae	haeresiaca
genitive	haeresiacōrum	haeresiacārum	haeresiacōrum
dative	haeresiacīs	haeresiacīs	haeresiacīs
accusative	haeresiacōs	haeresiacās	haeresiaca
ablative	haeresiacīs	haeresiacīs	haeresiacīs
vocative	haeresiacī	haeresiacae	haeresiaca

From the assumed Ancient Greek etymon *αἱρεσιακός (hairesiakós), from αἵρεσῐς (haíresĭs, “system of philosophic principles”, “sect”) + -ᾰκός (-ăkós).

noun · masculinesecond declension

haeresiacus²

haeresiacus m (genitive haeresiacī)

Classical[hae̯.rɛˈsi.a.kʊs]Ecclesiastical[e.reˈs̬iː.a.kus]

From the assumed Ancient Greek etymon *αἱρεσιακός (hairesiakós), from αἵρεσῐς (haíresĭs, “system of philosophic principles”, “sect”) + -ᾰκός (-ăkós).