What does syntheticus mean in Latin?

syntheticus, a adjective, means “synthetic”.

How do you pronounce syntheticus?

In classical Latin, [synˈtʰɛ.tɪ.kʊs]; in ecclesiastical (church) Latin, [sinˈtɛː.ti.kus].

adjectivefirst/second-declension adjective

syntheticus (feminine synthetica, neuter syntheticum)

Classical[synˈtʰɛ.tɪ.kʊs]Ecclesiastical[sinˈtɛː.ti.kus]

singular
form	masculine	feminine	neuter
nominative	syntheticus	synthetica	syntheticum
genitive	syntheticī	syntheticae	syntheticī
dative	syntheticō	syntheticae	syntheticō
accusative	syntheticum	syntheticam	syntheticum
ablative	syntheticō	syntheticā	syntheticō
vocative	synthetice	synthetica	syntheticum

plural
form	masculine	feminine	neuter
nominative	syntheticī	syntheticae	synthetica
genitive	syntheticōrum	syntheticārum	syntheticōrum
dative	syntheticīs	syntheticīs	syntheticīs
accusative	syntheticōs	syntheticās	synthetica
ablative	syntheticīs	syntheticīs	syntheticīs
vocative	syntheticī	syntheticae	synthetica

Learned borrowing from Ancient Greek συνθετικός (sunthetikós).