Bas·tard a.
  1. Begotten and born out of lawful matrimony; illegitimate. See Bastard, n., note.
  2. Lacking in genuineness; spurious; false; adulterate; -- applied to things which resemble those which are genuine, but are really not so.
     That bastard self-love which is so vicious in itself, and productive of so many vices.   --Barrow.
  3. Of an unusual or irregular make or proportion; as, a bastard musket; a bastard culverin. [Obs.]
  4. Print. Abbreviated, as the half title in a page preceding the full title page of a book.
  Bastard ashlar Arch., stones for ashlar work, roughly squared at the quarry.
  Bastard file, a file intermediate between the coarsest and the second cut.
  Bastard type Print., type having the face of a larger or a smaller size than the body; e. g., a nonpareil face on a brevier body.
  Bastard wing Zool., three to five quill feathers on a small joint corresponding to the thumb in some mammalia; the alula.