morphallaxis

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The regeneration of a body part involving structural or cellular reorganization of existing tissues, occurring chiefly in invertebrates.

from The Century Dictionary.

• noun The development of a new whole from a piece of an organism by a remodeling of the original piece into the typical form. A characteristic feature of the process is that it takes place without proliferation of new material at the cut surfaces of the piece. It is thus distinguished from the more common form of regeneration, or epimorphosis.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun biology The regeneration of specific tissue due to loss or death of the existing tissue.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun regeneration on a reduced scale of a body part; observed especially in invertebrates such as certain lobsters