To harden by heat; to burn or scorch.
From Latin 'adurere' (ad- 'to' + urere 'to burn'). The word gradually fell out of common use but survived in technical and poetic contexts.
This word is basically the ancestor of 'adust'—it's pure Latin for 'to burn toward' and shows how Medieval English borrowed directly from Latin when they needed words for heating and transformation processes.
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