noun.
Relating to the work of removing wreckage, as on a railway, of saving wrecked vessels or their cargoes, or of tearing down old buildings; also, such work itself.
the GNU version of the Collaborative International Dictionary of English
a. & n. from wreck, v.
a car fitted up with apparatus and implements for removing the wreck occasioned by an accident, as by a collision.
a pump especially adapted for pumping water from the hull of a wrecked vessel.