Here's what rhymes with dietetic.
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medic paramedic peptic eutectic derrick pectic authentic dialectic majestic metric pelvic angelic ferric relic septic aseptic hectic technic allelic benthic biogenic pyogenic sceptic steric geodesic diametric domestic academic epidemic generic endemic geometric symmetric esoteric pathogenic centric cleric enteric isometric obstetric polemic splenic cryogenic eugenic isomeric pandemic phrenic psychedelic skeptic tartaric totemic turmeric dyspeptic acerbic allergenic lovesick irenic telegenic electric systemic dielectric antigenic asymmetric eclectic epileptic epistemic forensic ischemic numeric parametric transgenic barometric iatrogenic neurogenic photometric psychogenic teratogenic androgenic apoplectic chimeric hysteric anorectic evangelic leukaemic paraplegic photogenic pyrotechnic paregoric redbrick unauthentic hypoallergenic dyslectic atmospheric eccentric antiseptic concentric mesenteric psychometric monomeric mutagenic anorexic dyslexic geocentric inauthentic ionospheric cataleptic polytechnic thermometric schizophrenic econometric colorimetric egocentric isoelectric neuroleptic piezoelectric neurasthenic nonacademic radiometric calisthenic narcoleptic nonelectric cliometric volumetric carcinogenic photoelectric anthropogenic ethnocentric nonparametric stoichiometric trigonometric alphanumeric heliocentric callisthenic hydroelectric anthropocentric hallucinogenic