Noun

1. A eucalypt tree occurring in the south west of Western Australia.
   • 2002, Richard Frankham, David A. Briscoe, Jonathan D. Ballou, Karina H. McInnes, Introduction to Conservation Genetics, page 103

     In contrast, resistance to root rot fungus in jarrah trees has a significant heritability (Box 5.1), so jarrahs can evolve to resist the introduced dieback.

2. The wood of the jarrah tree.
   • 1888, Rudyard Kipling, ‘The Broken-Link Handicap’, Plain Tales from the Hills, Folio 2005, p. 112:

     The walls were colonial ramparts—logs of jarrah spiked into masonry—with wings as strong as Church buttresses.