Etymology
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dander (n.1)

"scurf, dandruff," 1786; earlier dandro (1590s), of uncertain origin (see dandruff).

dander (n.2)

"temper, anger, passion," 1831, American English, of unknown origin; perhaps a figurative use somehow of dander (n.1), or of West Indian dander, dunder "fermentation of sugar" (in English from 1796), from Spanish redundar "to overflow," from Latin redundare (see redundant).

updated on June 25, 2018

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Definitions of dander from WordNet

dander (n.)
small scales from animal skins or hair or bird feathers that can cause allergic reactions in some people;
dander (n.)
a feeling of anger and animosity;
having one's hackles or dander up
Synonyms: hackles
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.