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From The Collaborative International Dictionary of English v.0.48:
Nib \Nib\ (n[i^]b), n. [A variabt of neb.] 1. A small and pointed thing or part; a point; a prong. "The little nib or fructifying principle." --Sir T. Browne. [1913 Webster] 2. (Zool.) The bill or beak of a bird; the neb. [1913 Webster] 3. The points of a pen; also, the pointed part of a pen; a short pen adapted for insertion in a holder. [1913 Webster] 4. One of the handles which project from a scythe snath; also, [Prov. Eng.], the shaft of a wagon. [1913 Webster] 5. pl. See his nibs, below. [PJC] his nibs Someone who gives a command or makes a demand, often one who acts in a self-important manner, sometimes one with authority; -- used mockingly as a jocose term, as if a title of honor, but not usually in the presence of the person referred to, and usually indicating resentment or contempt. [Colloq.] [PJC]