Here's what rhymes with alloantigenic.
antigenic pyogenic pathogenic splenic biogenic eugenic mutagenic neurogenic phrenic androgenic allergenic photogenic irenic telegenic transgenic cryogenic iatrogenic teratogenic hypoallergenic anthropogenic psychogenic neurasthenic schizophrenic carcinogenic calisthenic callisthenic hallucinogenic Words that almost rhyme with alloantigenic
epidemic polemic pandemic totemic pfennig academic endemic systemic epistemic ischemic leukaemic nonacademic technic benthic derrick genetic poetic authentic generic acetic diabetic pathetic pelvic angelic ascetic ferric relic peptic allelic eutectic steric dietetic geodesic geodetic medic fetich pectic domestic energetic kinetic prophetic athletic majestic metric esoteric forensic phonetic septic apathetic aseptic centric cleric enteric hectic emetic empathetic sceptic tartaric turmeric hermetic acerbic antithetic lovesick paregoric bathetic magnetic aesthetic sympathetic dialectic geometric symmetric antiseptic apologetic cosmetic epileptic esthetic mesenteric numeric alphabetic diuretic obstetric prosthetic frenetic isomeric monomeric psychedelic skeptic apoplectic chimeric dyspeptic hysteric evangelic paramedic paraplegic polytechnic pyrotechnic diametric gametic parenthetic redbrick unauthentic electric atmospheric synthetic anesthetic dielectric eccentric asymmetric concentric eclectic parametric anaesthetic isometric barometric cybernetic ontogenetic photometric anorexic dyslexic geocentric inauthentic peripatetic anorectic antipathetic homiletic splenetic unaesthetic unapologetic exegetic nonathletic unesthetic copacetic phrenetic dyslectic arithmetic phylogenetic unsympathetic antidiuretic egocentric ferromagnetic geomagnetic kinesthetic neuroleptic paramagnetic alphanumeric ionospheric cataleptic nonmagnetic thermometric onomatopoetic narcoleptic telekinetic econometric parasympathetic psychometric biosynthetic colorimetric ethnocentric nonparametric anthropocentric heliocentric radiometric nonelectric psychokinetic cliometric volumetric photoelectric photosynthetic isoelectric pharmacokinetic piezoelectric stoichiometric trigonometric electromagnetic hydroelectric