| Word | Plural |
|---|---|
| curriculum | curricula |
| focus | foci |
| medium | media |
| phenomenon | phenomena |
| minimum | minima |
| mouse | mice |
| spectrum | spectra |
| maximum | maxima |
| stimulus | stimuli |
| referendum | referenda |
| criterion | criteria |
| consortium | consortia |
| aquarium | aquaria |
| quantum | quanta |
| nucleus | nuclei |
| radius | radii |
| syllabus | syllabi |
| lexicon | lexica |
| oesophagus | oesophagi |
| ethos | ethe |
| locus | loci |
| fungus | fungi |
| terminus | termini |
| millennium | millennia |
| modulus | moduli |
| thesaurus | thesauri |
| rectum | recta |
| gymnasium | gymnasia |
| dictum | dicta |
| presidium | presidia |
| palladium | palladia |
| uterus | uteri |
| ileum | ilea |
| tetanus | tetani |
| rostrum | rostra |
| bacterium | bacteria |
| duodenum | duodena |
| calculus | calculi |
| atrium | atria |
| incubus | incubi |
| stylus | styli |
| endothelium | endothelia |
| addendum | addenda |
| hippocampus | hippocampi |
| disequilibrium | disequilibria |
| nimbus | nimbi |
| ovum | ova |
| stratus | strati |
| cactus | cacti |
| thymus | thymi |
| sarcophagus | sarcophagi |
| imperium | imperia |
| modicum | modica |
| caecum | caeca |
| sputum | sputa |
| bolus | boli |
| bacillus | bacilli |
| datum | data |
| papyrus | papyri |
| jejunum | jejuna |
| abacus | abaci |
| cumulus | cumuli |
| pres. | pres |
| triforium | triforia |
| phylum | phyla |
| humerus | humeri |
| cryptosporidium | cryptosporidia |
| amicus | amici |
| louse | lice |
| torus | tori |
| eucalyptus | eucalypti |
| substratum | substrata |
| phallus | phalli |
| pallium | pallia |
| reticulum | reticula |
| sternum | sterna |
| factum | facta |
| tyrannosaurus | tyrannosauri |
| dormouse | dormice |
| thrombus | thrombi |
| optimum | optima |
| modus | modi |
| cirrus | cirri |
| ramus | rami |
| gonococcus | gonococci |
| pylorus | pylori |
| staphylococcus | staphylococci |
| hypothalamus | hypothalami |
| perihelion | perihelia |
| collegium | collegia |
| fundus | fundi |
| actus | acti |
| proteus | protei |
| cantharus | canthari |
| aureus | aurei |
| mycobacterium | mycobacteria |
| rhombus | rhombi |
| thalamus | thalami |
| tarsus | tarsi |
| tentorium | tentoria |
| streptococcus | streptococci |
| vicus | vici |
| operculum | opercula |
| colliculus | colliculi |
| gyrus | gyri |
| callosum | callosa |
| plasmodium | plasmodia |
| malleus | mallei |
| colostrum | colostra |
| koruna | korun |
| endometrium | endometria |
| magus | magi |
| abomasum | abomasa |
| flocculus | flocculi |
| trapezius | trapezii |
| clostridium | clostridia |
| sulcus | sulci |
| villus | villi |
| rhizobium | rhizobia |
| intaglio | intagli |
| naevus | naevi |
| denarius | denarii |
| tumulus | tumuli |
| scriptorium | scriptoria |
| erratum | errata |
| dominus | domini |
| fideicommissum | fideicommissa |
| icosahedron | icosahedra |
| regulus | reguli |
| tergum | terga |
| taxon | taxa |
| centrum | centra |
| pleuron | pleura |
| mycelium | mycelia |
| talus | tali |
| scutum | scuta |
| effluvium | effluvia |
| bronchus | bronchi |
| jack-in-the-box | jacks-in-boxes |
| prementum | prementa |
| caldarium | caldaria |
| octahedron | octahedra |
| perineum | perinea |
| four-momentum | four-momenta |
| protocerebrum | protocerebra |
| candelabrum | candelabra |
| dodecahedron | dodecahedra |
| spermatozoon | spermatozoa |
| woodlouse | woodlice |
| sacrum | sacra |
| homunculus | homunculi |
| caduceus | caducei |
| gladiolus | gladioli |
| priapus | priapi |
| cursus | cursi |
| faunus | fauni |
| septum | septa |
| protozoan | protozoa |
| desideratum | desiderata |
| flagellum | flagella |
| collum | colla |
| chiasmus | chiasmi |
| argenteus | argentei |
| anencephalus | anencephali |
| clypeus | clypei |
| syconium | syconia |
| mediastinum | mediastina |
| umbilicus | umbilici |
| colluvium | colluvia |
| labium | labia |
| protozoon | protozoa |
| mytilus | mytili |
| exemplum | exempla |
| postnotum | postnota |
| ilium | ilia |
| mysterium | mysteria |
| pretectum | pretecta |
| sartorius | sartorii |
| pallidum | pallida |
| extremum | extrema |
| thallus | thalli |
| agrobacterium | agrobacteria |
| fusarium | fusaria |
| oidium | oidia |
| cubitus | cubiti |
| esophagus | esophagi |
| pretarsus | pretarsi |
| epiphenomenon | epiphenomena |
| cerebrum | cerebra |
| vagus | vagi |
| myoclonus | myocloni |
| acetabulum | acetabula |
| deutocerebrum | deutocerebra |
| epicranium | epicrania |
| coccus | cocci |
| cacoethes | cacoethe |
| latissimus | latissimi |
| perithecium | perithecia |
| lactobacillus | lactobacilli |
| notum | nota |
| oppidum | oppida |
| microfocus | microfoci |
| serratus | serrati |
| sacrosanctum | sacrosancta |
| frigidarium | frigidaria |
| succubus | succubi |
| arolium | arolia |
| medius | medii |
| puerperium | puerperia |
| praetorium | praetoria |
| corynebacterium | corynebacteria |
| absurdum | absurda |
| paraflocculus | paraflocculi |
| nidus | nidi |
| enterococcus | enterococci |
| stratocumulus | stratocumuli |
| epimeron | epimera |
| paramecium | paramecia |
| embolus | emboli |
| pinetum | pineta |
| prescutum | prescuta |
| fasciculus | fasciculi |
| oculus | oculi |
| clivus | clivi |
| glomerulus | glomeruli |
| himation | himatia |
| oxyrhynchus | oxyrhynchi |
| capitulum | capitula |
| microbacterium | microbacteria |
| pudendum | pudenda |
| alveolus | alveoli |
| colonus | coloni |
| aspergillus | aspergilli |
| haustorium | haustoria |
| stabilimentum | stabilimenta |
| paludarium | paludaria |
| minimus | minimi |
| punctum | puncta |
| solidus | solidi |
| unicum | unica |
| obliquus | obliqui |
| nummus | nummi |
| laconicum | laconica |
| lepton | lepta |
| gorgoneion | gorgoneia |
| castrum | castra |
| volvulus | volvuli |
| perineurium | perineuria |
| astragalus | astragali |
| syncytium | syncytia |
| pandaemonium | pandaemonia |
| fieldmouse | fieldmice |
| velum | vela |
| ommatidium | ommatidia |
| hilum | hila |
| archeus | archei |
| conus | coni |
| phylon | phyla |
| arcus | arci |
| periosteum | periostea |
| archaebacterium | archaebacteria |
| periostracum | periostraca |
| contrapunctus | contrapuncti |
| ginglymus | ginglymi |
| schoenus | schoeni |
| gubernaculum | gubernacula |
| tapetum | tapeta |
| discobolus | discoboli |
| tritocerebrum | tritocerebra |
| agendum | agenda |
| canaliculus | canaliculi |
| halobacterium | halobacteria |
| submentum | submenta |
| velarium | velaria |
| succus | succi |
| endocardium | endocardia |
| mentum | menta |
| sestertius | sestertii |
| relatum | relata |
| frenulum | frenula |
| polyhedron | polyhedra |
| primordium | primordia |
| periplus | peripli |
| dentalium | dentalia |
| porphyrogenitus | porphyrogeniti |
| sporangium | sporangia |
| definiendum | definienda |
| solatium | solatia |
| presbyterium | presbyteria |
| latifundium | latifundia |
| nodus | nodi |
| amphioxus | amphioxi |
| cecum | ceca |
| neopallium | neopallia |
| pangasius | pangasia |
| aphelion | aphelia |
| doormouse | doormice |
| supermouse | supermice |
| pneumococcus | pneumococci |
| aedeagus | aedeagi |
| mortarium | mortaria |
| compluvium | compluvia |
| lamellipodium | lamellipodia |
| vomitorium | vomitoria |
| acinus | acini |
| prosternum | prosterna |
| dorsum | dorsa |
| arcanum | arcana |
| minifundium | minifundia |
| carrus | carri |
| ocellus | ocelli |
| pygidium | pygidia |
| micrococcus | micrococci |
| subendothelium | subendothelia |
| soleus | solei |
| encrinus | encrini |
| thyrsus | thyrsi |
| pediculus | pediculi |
| urus | uri |
| manubrium | manubria |
| ephippium | ephippia |
| epigastrium | epigastria |
| inion | inia |
| neuroepithelium | neuroepithelia |
| beatus | beati |
| ischium | ischia |
| mitochondrion | mitochondria |
| carpus | carpi |
| prolegomenon | prolegomena |
| meningococcus | meningococci |
| analogon | analoga |
| ovulum | ovula |
| explicandum | explicanda |
| empodium | empodia |
| mesangium | mesangia |
| uraeus | uraei |
| colpus | colpi |
| lemniscus | lemnisci |
| incunabulum | incunabula |
| lustrum | lustra |
| presternum | presterna |
| pilus | pili |
| cuniculus | cuniculi |
| famulus | famuli |
| rectus | recti |
| designatum | designata |
| postscriptum | postscripta |
| zoon | zoa |
| corniculum | cornicula |
| superstimulus | superstimuli |
| oncomouse | oncomice |
| retinaculum | retinacula |
| milium | milia |
| vexillum | vexilla |
| microthrombus | microthrombi |
| pronotum | pronota |
| florilegium | florilegia |
| superstratum | superstrata |
| echinococcus | echinococci |
| eidolon | eidola |
| hypermedium | hypermedia |
| suspensorium | suspensoria |
| myometrium | myometria |
| pedunculus | pedunculi |
| collyrium | collyria |
| stilus | stili |
| stadion | stadia |
| calcaneus | calcanei |
| nucleolus | nucleoli |
| dysequilibrium | dysequilibria |
| postclypeus | postclypei |
| katepisternum | katepisterna |
| vomitus | vomita |
| finocchio | finocchi |
| bifidobacterium | bifidobacteria |
| ostium | ostia |
| anteclypeus | anteclypei |
| gonopodium | gonopodia |
| itinerarium | itineraria |
| cingulum | cingula |
| hyperstimulus | hyperstimuli |
| sacrarium | sacraria |
| compactum | compacta |
| borborygmus | borborygmi |
| xoanon | xoana |
| hyperstriatum | hyperstriata |
| cryptococcus | cryptococci |
| hilus | hili |
| ayup | plw |
| prostomium | prostomia |
| convivium | convivia |
| lobus | lobi |
| salivarium | salivaria |
| hypolimnion | hypolimnia |
| profluvium | profluvia |
| tectum | tecta |
| fusobacterium | fusobacteria |
| xystus | xysti |
| ichthyosaurus | ichthyosauri |
| urbarium | urbaria |
| penetralium | penetralia |
| mesosternum | mesosterna |
| pseudopodium | pseudopodia |
| sudarium | sudaria |
| formicarium | formicaria |
| castellum | castella |
| eubacterium | eubacteria |
| tablinum | tablina |
| xenodochium | xenodochia |
| dinosaurus | dinosauri |
| mesothelium | mesothelia |
| prytaneum | prytanea |
| puparium | puparia |
| supremum | suprema |
| interstitium | interstitia |
| gastrocnemius | gastrocnemii |
| propodeum | propodea |
| tetrapylon | tetrapyla |
| propodium | propodia |
| androecium | androecia |
| explanandum | explananda |
| noumenon | noumena |
| precordium | precordia |
| metacarpus | metacarpi |
| scutellum | scutella |
| metatarsus | metatarsi |
| instrumentarium | instrumentaria |
| cumulo-nimbus | cumulo-nimbi |
| splenius | splenii |
| polyptoton | polyptota |
| proemium | proemia |
| syncellus | syncelli |
| retiarius | retiari |
Note: these words have been obtained from Wiktionary and have been classified and improved through automated computer linguistics processes.