Source : Webster's Revised Unabridged Dictionary (1913)

Dander \Dan"der\, n. [Corrupted from dandruff.]
   1. Dandruff or scurf on the head.

   2. Anger or vexation; rage. [Low] --Halliwell.

Dander \Dan"der\, v. i. [See {Dandle}.]
   To wander about; to saunter; to talk incoherently. [Prov.
   Eng.] --Halliwell.

Source : WordNet®

dander
     n 1: small scales from animal skins or hair or bird feathers that
          can cause allergic reactions in some people
     2: a feeling of anger and animosity; "having one's hackles or
        dander up" [syn: {hackles}]