What does sīriacus mean in Latin?

sīriacus, a adjective, means “Dog Star”.

How do you pronounce sīriacus?

In classical Latin, [siːˈri.a.kʊs]; in ecclesiastical (church) Latin, [siˈriː.a.kus].

adjectivefirst/second-declension adjective

sīriacus (feminine sīriaca, neuter sīriacum)

Classical[siːˈri.a.kʊs]Ecclesiastical[siˈriː.a.kus]

singular
form	masculine	feminine	neuter
nominative	sīriacus	sīriaca	sīriacum
genitive	sīriacī	sīriacae	sīriacī
dative	sīriacō	sīriacae	sīriacō
accusative	sīriacum	sīriacam	sīriacum
ablative	sīriacō	sīriacā	sīriacō
vocative	sīriace	sīriaca	sīriacum

plural
form	masculine	feminine	neuter
nominative	sīriacī	sīriacae	sīriaca
genitive	sīriacōrum	sīriacārum	sīriacōrum
dative	sīriacīs	sīriacīs	sīriacīs
accusative	sīriacōs	sīriacās	sīriaca
ablative	sīriacīs	sīriacīs	sīriacīs
vocative	sīriacī	sīriacae	sīriaca

sīrĭăcus, a, um, adj., = σειριακός,

I. of or belonging to the dog-star: calor, Avien. Arat. 285.