What does ī graeca mean in Latin?

ī graeca, a noun, means “A name of the letter Y.”.

How do you pronounce ī graeca?

In classical Latin, [ˈiː ˈɡrae̯.ka]; in ecclesiastical (church) Latin, [ˈiː ˈɡrɛː.ka].

noun

ī graeca f

Classical[ˈiː ˈɡrae̯.ka]Ecclesiastical[ˈiː ˈɡrɛː.ka]

Literally "Greek i"; as it mostly appeared in words of Greek origin and became pronounced identically to i.