Bar sinister Meaning, Definition & Usage

  1. noun the status of being born to parents who were not married
    illegitimacy; bastardy.
  2. noun a mark of bastardy; lines from top right to bottom left
    bend sinister.

WordNet

Definitions
  1. (Her.), a term popularly but erroneously used for baton, a mark of illegitimacy. See Baton.
Definitions
  1. . (Her.) See under Bar, n.

Webster 1913