Entry 1 sense Webster, 1913 Jarrah · Jar·rah · IPA /ˈd͡ʒæɹə/ 01 n. The mahoganylike wood of the Australian Eucalyptus marginata. See Eucalyptus. 1. The mahoganylike wood of the Australian Eucalyptus marginata. See Eucalyptus. See: Eucalyptus