Original: Vetus Latina is a collective name given to the Biblical texts in Latin that were translated before St Jerome's Vulgate Bible (382-405 AD) became the standard Bible for Latin-speaking Western Christians. The phrase Vetus Latina is Latin for Old Latin, and the Vetus Latina is sometimes known as the Old Latin Bible.
Simplified: Vetus Latina is the name given to a collection of Biblical texts that were translated into Latin before the Vulgate became the standard version used in the Latin-speaking world.