Source : Webster's Revised Unabridged Dictionary (1913)

Nardoo \Nar*doo"\, n. (Bot.)
   An Australian name for {Marsilea Drummondii}, a four-leaved
   cryptogamous plant, sometimes used for food.

Source : WordNet®

Marsilea drummondii
     n : Australian clover fern [syn: {nardoo}, {nardo}, {common
         nardoo}]