Any antigen that stimulates autoantibodies in the organism that produced it; an antigen produced by the self (that is, by one's own tissues).

plural of matchstick

(pharmacology) A narrow spectrum penicillin antibiotic.

(organic chemistry) A phenolic anthraquinone, 2-hexanoyl-1,3,6,8-tetrahydroxyanthracene-9,10-dione, that has anticancer activity