rose apple noun6 •Any of various Syzygium species or their fruit. •Syzygium aqueum, the watery rose apple. •Syzygium jambos, the jambu fruit. •Syzygium malaccense, the Malay rose apple. •Syzygium samarangense, the Semarang rose-apple or wax jambu. •Angophora costata, a common woodland and forest tree of Eastern Australia. formsrose apples