Adust \A*dust"\, a. [L. adustus, p. p. of adurere: cf. F. aduste.]

1. Inflamed or scorched; fiery. ``The Libyan air adust.'' --Milton.

2. Looking as if or scorched; sunburnt.

A tall, thin man, of an adust complexion. --Sir W. Scott.

3. (Med.) Having much heat in the constitution and little serum in the blood. [Obs.]

Hence: Atrabilious; sallow; gloomy.

Source: Webster's Revised Unabridged Dictionary (1913)