Artificial intelligent assistant

twin-brother

twin-brother
  (Now usu. as two words.)
  [twin a. 3.]
  A brother born at the same birth, as one of twins. Also fig. something closely related to or resembling the other thing mentioned.

1598 Shakes. Merry W. ii. i. 74 Heere's the twyn-brother of thy Letter: but let thine inherit first, for I protest mine neuer shall. 1727 Swift Wonder of Wonders Wks. 1755 II. ii. 51 He hath..a twin-brother, who lives over against him. 1829 Lytton Devereux i. iii, My twin brother, Gerald, was a tall, strong, handsome boy. 1850 Tennyson In Mem. lxviii, Sleep, Death's twin-brother.

Oxford English Dictionary

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