n.
A dry scab or slough formed on the skin as a result of a burn or by the action of a corrosive or caustic substance.
[Middle English escare, from Old French. See scar1.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.