heterophilic,a.|ˌhɛtərəʊˈfɪlɪk| [f.prec. + -ic.] = heterophile a. 1929Jrnl.Exper.Med. XLIX. 497 Horse serum is known to contain a heterophilic antigen.1966Jrnl. Cell Biol. XXIX. 309 (caption) Thin section of heterophilic myelocyte found in rabbit bone marrow.