Artificial intelligent assistant

rastilbow

rastilbow Obs. rare—0.
  [Corruptly ad. med.L. resta bovis or OF. reste de beof (mod.F. arrête bœuf), lit. ‘stopping of the ox’.]
  The plant rest-harrow.

c 1440 Promp. Parv. 424/1 Rastylbow, wede, resta bovis.

Oxford English Dictionary

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