necro-, necr-, necron-, -necrosis, nekro- +

(Greek: dead, death, dead body; dead tissue or cells; corpse)

synnecrosis
An interaction between individuals or populations so mutually detrimental that it results in death, as in the case of some parasitic relationships.
thrombonecrosis
Necrosis (death) of the walls of a blood vessel.

Related "death, dead; kill" units: -cide; lethal-; mort-; neci-; phono-; thanato-.