What does islāmicus mean in Latin?

islāmicus, a adjective, means “Islamic”.

How do you pronounce islāmicus?

In classical Latin, [ɪsˈɫaː.mɪ.kʊs]; in ecclesiastical (church) Latin, [izˈlaː.mi.kus].

adjectivefirst/second-declension adjective

islāmicus (feminine islāmica, neuter islāmicum)

Classical[ɪsˈɫaː.mɪ.kʊs]Ecclesiastical[izˈlaː.mi.kus]

New LatinadjectiveIslamic
Ita Abulſeda: Solebant olim Arabes quædam facere, quæ poſtea præcepit Lex Islamica &c. apud Pocokium.1746, Johann-Jacob II Breitinger, Johannes-Jacobus Zimmermann, Museum helveticum ad juvandas literas in publicos usus apertum, →OCLC, page 46:
Quosnam interpretes Islamicos, ut vocas, hac in materia legeris (ſiquidem ad eos provocas) & quid inibi de hac materia repereris, nuncia quæſo.1750, Louis Du Four de Longuerue, Joa. Diet Wincklerus, Dissertationes de variis epochis et anni forma veterum Orientalium; de vita S. Justini martyris; de Athenagora, […] , →OCLC, page 299:

singular
form	masculine	feminine	neuter
nominative	islāmicus	islāmica	islāmicum
genitive	islāmicī	islāmicae	islāmicī
dative	islāmicō	islāmicae	islāmicō
accusative	islāmicum	islāmicam	islāmicum
ablative	islāmicō	islāmicā	islāmicō
vocative	islāmice	islāmica	islāmicum

plural
form	masculine	feminine	neuter
nominative	islāmicī	islāmicae	islāmica
genitive	islāmicōrum	islāmicārum	islāmicōrum
dative	islāmicīs	islāmicīs	islāmicīs
accusative	islāmicōs	islāmicās	islāmica
ablative	islāmicīs	islāmicīs	islāmicīs
vocative	islāmicī	islāmicae	islāmica

From Islāmus (“Islam”) + -icus.