Artificial intelligent assistant

dufoil

dufoil Her.
  (ˈdjuːfɔɪl)
  [f. L. duo two + foil leaf; cf. trefoil, cinquefoil.]
  A two-leaved flower; the plant Twayblade (Listera ovata).

1688 R. Holme Armoury ii. iv. §2. 58 He beareth Argent, a Dufoile or Twyfoile, Vert, flowered, Purpure. The Flower is like that which we commonly call Dogstones,..but more spireing. 1889 Elvin Heraldry Gloss., Dufoil, or Twyfoil, having only two leaves.

Oxford English Dictionary

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