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From The Collaborative International Dictionary of English v.0.48:
Bastard \Bas"tard\, a. 1. Begotten and born out of lawful matrimony; illegitimate. See Bastard, n., note. [1913 Webster] 2. Lacking in genuineness; spurious; false; adulterate; -- applied to things which resemble those which are genuine, but are really not so. [1913 Webster] That bastard self-love which is so vicious in itself, and productive of so many vices. --Barrow. [1913 Webster] 3. Of an unusual or irregular make or proportion; as, a bastard musket; a bastard culverin. [Obs.] [1913 Webster] 4. (Print.) Abbreviated, as the half title in a page preceding the full title page of a book. [1913 Webster] 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. [1913 Webster]