• (British) IPA: /əˈdʌst/

adust

1. (medicine, historical, usually postpositive, of a bodily humour) Abnormally dark or over-concentrated; associated with various states of discomfort or illness (specifically being too hot or dry). [from 15th c.]
   • 1624, Democritus Junior [pseudonym; Robert Burton], The Anatomy of Melancholy: […], 2nd edition, Oxford, Oxfordshire: Printed by John Lichfield and James Short, for Henry Cripps, OCLC 54573970 ↗:

     , I.1:

     But, Wecker says, from melancholy adust arises one kind; from choler another, which is most brutish; from phlegm another, which is dull; and from blood another, which is the best.

   • 1646, Thomas Browne, Pseudodoxia Epidemica, VI.12:

     […] so in fevers and hot distempers from choler adust is caused a blackness in our tongues, teeth and excretions  […] .

2. (by extension) Hot and dry; thirsty or parched.
   • 1863, George Eliot, Romola, Volume II, Book III, Chapter XXV, page 307

     He was tired and adust with long riding; but he did not go home.

3. (now rare) Burnt or having a scorched color. [from 15th c.]