See under burn1 (def. 38).
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How to use third-degree burn in a sentence
As she leaned forward, her shirt went up in flames, and when she tried to pull it off, her arm caught fire, leading to third-degree burns over nearly one-fifth of her body.More burn injuries are occurring in kitchens during pandemic. Thanksgiving may see a rise in these accidents. | Katherine Ellison | November 22, 2020 | Washington Post
British Dictionary definitions for third-degree burn
pathol See burn 1 (def. 23)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012