12 letter words ending in is in the mammoth uncensored word list.

acantholysis achromatosis acrocyanosis adenomatosis adenomycosis adipogenesis aeroneurosis agamogenesis amelogenesis anacatharsis anaerobiosis anamorphosis anaplasmosis androgenesis angiogenesis angiokinesis angiomatosis angiopoiesis apexogenesis appendicitis ascaridiasis ascaridiosis athrocytosis autohypnosis avitaminosis barophoresis besnoitiosis bilharziasis bilharziosis biocatalysis biosynthesis blastocystis bombogenesis bradyauxesis bradygenesis bradykinesis bromhidrosis cactoblastis caenogenesis cainogenesis capilariosis cataphoresis cellulolysis cerebellitis chemiosmosis chemokinesis chlamydiosis chorioiditis chromidrosis cladogenesis clitoriditis coenesthesis colicystitis colipyelitis collagenosis colocentesis colorectitis colpoxerosis cosmogenesis coxarthritis coxarthrosis cranioclasis craniostosis cryptobiosis crystallitis cyanhidrosis cyanogenesis cyclogenesis decorticosis diphtheritis diplogenesis distichiasis distomatosis douroucoulis dracontiasis dyskeratosis ectodermosis ehrlichiosis electrolysis electrotaxis encephalitis endocarditis endometritis enterobiasis enteroptosis epanorthosis epididymitis epiglottitis epimorphosis episcleritis fascioliasis fibrinolysis fibromatosis folliculitis furunculosis galvanotaxis ganglionitis gastrodermis gastroxynsis geotrichosis glucogenesis glycerolysis glycogenesis glycogenosis gonarthritis haematemesis haematolysis haemopoiesis hallucinosis hamarthritis hemarthrosis hemerocallis hemodialysis hemophilosis heterauxesis hexamitiasis hidradenitis histogenesis histomonosis homoeostasis hypergenesis hyperidrosis hyperkinesis hyperostosis hypnogenesis hypohidrosis hypohydrosis hypophysitis iliocostalis iliolumbalis interkinesis ionophoresis iridodonesis kainogenesis karyokinesis karyomitosis ketoacidosis kinaesthesis lagenidiosis leucocytosis leucopoiesis leukocytosis leukopoiesis lithogenesis lymphangitis lymphostasis macrocytosis mastocytosis megatsunamis melanidrosis mesenteritis methanolysis microcytosis micronemosis misdiagnosis molybdenosis mononeuritis morphallaxis mucormycosis myelocytosis myofasciitis mythogenesis nephroptosis neurogenesis neuropoiesis nonsynthesis oesophagitis ophthalmitis orthogenesis orthotonesis osteogenesis osteoporosis otosclerosis ovalocytosis overanalysis overemphasis paedogenesis palingenesis panarthritis pancreatitis paracentesis paraphimosis parapophysis parasiopesis parasynapsis pathogenesis pericarditis perichoresis perineuritis petrogenesis phagocytosis phlebostasis photokinesis phycomycosis phylogenesis phytogenesis pneumocystis podoconiosis polyhedrosis polymyositis polyneuritis posthypnosis postsynapsis precirrhosis prediagnosis presbyacusis presbycousis pseudocyesis psychognosis rachischisis rickettiosis sacrocoxitis sacroiliitis salpiglossis sarcomatosis schindylesis schwarmereis selfanalysis semiellipsis semispinalis somaesthesis somatognosis spaghettinis sporogenesis stereognosis strongylosis supraglottis svarabhaktis synaesthesis synarthrosis tachyauxesis tachygenesis thrombolysis toxidermitis toxocariasis transgenesis trichiniasis trichuriasis trombidiasis trophallaxis trophobiosis trypanolysis tuberculosis uncinariasis ureterolysis urinanalysis urolithiasis vestibulitis zygapophysis