Definition of Port Arthur plum in US English:

Port Arthur plum

noun

  • A Tasmanian shrub or small tree, Cenarrhenes nitida (family Proteaceae), that bears large purple fleshy fruit.

Origin

Mid 19th century; earliest use found in John Lindley (1799–1865), botanist and horticulturist. From Port Arthur, the name of an inlet in Tasmania (the site of a former penal colony) + plum.

Pronunciation

Port Arthur plum

/pɔːt ˌɑːθə ˈplʌm/