Dăn'der1, n.
n. [Corrupted from dandruff.] 1. The dandruff or scurf which forms on the head at the root of the hair.
Sense 2. Anger or vexation. [Low.] Halliwell. To get up one's dander, or to have one's dander raised, to get into a passion. Here, it would seem, the dandruff is ludicrously put for the hair itself, which is represented as being raised on end, like the fur of some animals when enraged. Bartlett.