Artificial intelligent assistant

libella

liˈbella Ent. Obs.
  [mod.L. (Moufet 1634); perh. an application of L. lībella (see level n.), with reference to the horizontal extension of the wings.]
  An early scientific name for the dragon-fly. (Cf. Libellula.)

1694 Libellæ [see dragon-fly]. 1774 Goldsm. Nat. Hist., Insects ii. ii, Of the Libella, or Dragon-fly.

Oxford English Dictionary

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