Artificial intelligent assistant

derner

ˈderner Obs.
  Also dirner.
  [Etymology unknown: ? connected with dern, durn, door-frame.]
  The lintel of a door.

a 1300 Cursor M. 6078 (Cott.) Þis lamb blod..Þar-wit yee mak þan takning, On aiþer post þer hus to smer, A takin o tav on þair derner [v.r. dernere]. Ibid. 6103 (Cott.) On þair post and on dirner.

Oxford English Dictionary

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