Necrosis
Necrosis (ne*krō"sis) , noun
[New Latin, from Greek ne`krwsis, from nekroy^n to make dead, to mortify, nekro`s a dead body.]
1.
(Medicine) The pathologic death of part of a tissue due to irreversible damage. Contrast to necrobiosis, which is a normal death of cells in a tissue. Formerly, applied primarily to death of bone tissue.
2.
(Botany) A disease of trees, in which the branches gradually dry up from the bark to the center.