What does allograft mean?
An allograft is a piece of tissue or an organ that is transplanted from one individual into another genetically distinct individual of the same species. The term belongs primarily to medicine and surgery, where it distinguishes this type of transplant from related procedures: an autograft moves tissue within a single person's own body, an isograft transfers tissue between genetically identical individuals such as identical twins, and a xenograft crosses species boundaries. Common examples include bone, skin, corneas, heart valves, and whole organs obtained from living donors or cadavers through tissue banks. Because an allograft carries foreign genetic material, the recipient's immune system typically recognizes it as non-self and may attack it — a phenomenon known as allograft rejection — so patients usually require immunosuppressive drugs. Allografts are central to modern transplant medicine and are also widely used in orthopedics, dentistry, and burn treatment.
nounA graft of tissue or an organ taken from one individual and transplanted into another individual of the same species who is genetically distinct from the donor.
- Tissue or organ transplanted from a genetically non-identical member of the same species.
"The surgeon used a cadaveric allograft to reconstruct the patient's damaged knee ligament."
"Following severe burns, the burn unit applied a skin allograft from a tissue bank to protect the wound while it healed."
"Because the donor heart was an allograft rather than an isograft, the recipient required lifelong immunosuppressive therapy."
Standard pluralization; commonly used when discussing tissue banks or multiple transplants performed in a procedure.
"The tissue bank processed hundreds of allografts last year for use in orthopedic surgeries."
Your immune system can't tell a life-saving allograft from an invader — which is why transplant patients take drugs for the rest of their lives to keep their own bodies from destroying the gift.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of allograft
Allograft derives from Greek roots: 'allos,' meaning 'other' or 'different,' combined with 'graft,' a word of uncertain origin adopted into English via Middle French in the fifteenth century. The compound emerged in twentieth-century medical terminology as transplantation science matured, alongside sibling terms like autograft and xenograft built on the same pattern. Its Greek root 'allo-' also appears in many other scientific words denoting difference or variation, such as allomorph and allopathy.
Related word forms
How allograft is actually used
Allograft is a technical term used chiefly in medicine, surgery, immunology, and transplant-related contexts; it rarely appears in casual conversation. It is standard in both American and British medical literature. The word carries a clinical, neutral connotation.
Easily confused with allograft
An autograft is transplanted from one part of a person's body to another part of the same person, whereas an allograft comes from a different individual of the same species.
A xenograft is transplanted between individuals of different species (such as pig tissue into a human), whereas an allograft is between individuals of the same species.
An isograft is a transplant between genetically identical individuals, such as identical twins, while an allograft is between genetically distinct members of the same species.