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tr.v. de·roofed, de·roofing, de·roofs
1. To remove the roof from (a building, for example).
2. To remove tissue from (a wound, cyst, or other lesion) in order to promote healing.
to remove a portion of tissue surrounding an enclosed lesion permanently exposing the cavity which is left to heal by second intention. Used most commonly in the treatment of rectal fistulae.