Artificial intelligent assistant

backmost

backmost, a.
  (ˈbækməst)
  [f. back a.; a late formation after the type of foremost, hindmost: see -most. Cf. backermost.]
  Most to the back, hindmost; the opposite of foremost.

1782 A. Monro Compar. Anat. 98 The four backmost teeth. 1874 Farrar Christ II. xlii. 95 Though now the axe was uplifted, nay, though it was at its backmost poise.

Oxford English Dictionary

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