noun.
Surgical excision of dead, devitalized, or contaminated tissue and removal of foreign matter from a wound.
The Century Dictionary and Cyclopedia
noun.
In surgery, a loosing or unbridling by cutting the soft parts, as around a wound or an abscess, to permit the passage of pus, or for the removal of a stricture or an obstacle of any kind.
the GNU version of the Collaborative International Dictionary of English
noun.
the surgical excision of dead, contaminated, or damaged tissue, and foreign matter, especially from a wound.