ustulate

/ˈʌstjəleɪt/
verb
  1. To burn or scorch, especially the surface of something.
    • The sun's rays ustulate the desert rocks until they crack.
    • Careless campers can ustulate the grass if they leave a fire unattended.
    • The blacksmith would ustulate the metal to harden its outer layer.
Antonyms
adjective
  1. Scorched or burned, especially on the surface.
    • The ustulate bread was too dark to serve to guests.
    • He scraped the ustulate crust off the toast.
    • After the wildfire, the hillside was covered in ustulate soil.