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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| histocompatibility antigen | |
| —n | |
| a molecule occurring on the surface of tissue cells that can take several different forms. The differences between histocompatibility antigens are inherited and determine organ transplant rejection | |
histocompatibility antigen n.
Any of various antigens on the surface of cell membranes that serve to identify a cell as self or nonself and are used to determine whether a tissue graft or transfusion will be accepted by a recipient.