nardoo
Concise Oxford English Dictionary © 2008 Oxford University Press:
nardoo /nɑːˈduː, ˈnɑːduː/
▶noun an Australian fern with long stalks bearing either silvery-green lobes or woody cases containing spores. [Marsilea drummondii.]
– origin C19: from an Aborig. lang.
'nardoo' also found in these Oxford entries:

