Real Words Without Definition
This one is a judgement call.
A scientific or medical word built out of Greek and Latin roots. This is the biggest group in the list, about a third of everything.
Medicine gives us anconitis, inflammation of the elbow, and adenalgy, pain in a gland. Chemistry gives us acetylsalicylic. Anatomy, botany and zoology all do the same thing.
Once you know the roots they are completely predictable, which is why no dictionary lists them all. You can keep making new ones forever.
18,355 words · sorted A to Z · each with a line on why it is here
Matches the word itself, not the note beside it. Case does not matter.
| Word, sorted Z to A | Field and meaning |
|---|---|
| opisthoporeia | medical, involuntary walking backward |
| opisthotonoid | medical, resembling opisthotonos |
| opodidymus | teratology, twin monster joined at the face |
| opodymus | teratology, shortened form of opodidymus |
| oppositipinnate | botany, pinnate with opposite leaflets |
| oppositipolar | biology, having opposite poles |
| opsisform | medical, having the appearance of |
| opsistype | taxonomy, a type specimen actually examined |
| opsonogen | immunology, precursor substance of opsonin |
| opsonology | medical, the study of opsonins |
| opsonometry | medical, measurement of the opsonic index |
| opsonophoric | immunology, carrying or bearing opsonin |
| opticociliary | anatomy, of optic nerve and ciliary body |
| opticon | optics, a projecting instrument (cf. panopticon) |
| opticopapillary | anatomy, of the optic nerve and papilla |
| opticopupillary | anatomy, of the optic nerve and pupil |
| optoblast | histology, a cell of the optic layer |
| optomeninx | anatomy, membrane sheathing the optic nerve |
| optotechnics | optics, the technology of optical instruments |
| oralogist | medical, one who studies the mouth |
| oralogy | medical, the study of the mouth |
| orbiculatocordate | botany, roundish and heart-shaped (leaf) |
| orbiculatoelliptical | botany, roundish-elliptical (leaf) |
| orbitelar | zoology, of the orb-weaving spiders |
| orbitelarian | zoology, an orb-weaving spider |
| orbitele | zoology, an orb-web spider |
| orbitelous | zoology, spinning an orbicular web |
| orbitolite | zoology, an orbitolitid foraminifer |
| orbitomalar | anatomy, of the orbit and the malar bone |
| orbitopalpebral | anatomy, of the orbit and the eyelid |
| orbitostat | craniometry, device for orienting the orbit |
| orchectomy | surgery, removal of a testicle |
| orcheitis | medical, inflammation of a testicle |
| orchestian | zoology, a sandhopper of genus Orchestia |
| orchestiid | zoology, an amphipod of the Orchestiidae |
| orchichorea | medical, twitching of the testis |
| orchidacean | botany, a plant of the orchid family |
| orchidocele | medical, tumor or hernia of the testis |
| orchidocelioplasty | surgery, placing the testis in the abdomen |
| orchidoplasty | surgery, plastic repair of the testis |
| orchidoptosis | medical, downward displacement of the testis |
| orchidorrhaphy | surgery, suturing of the testis |
| orchidotherapy | medical, treatment with testicular extract |
| orchiencephaloma | medical, soft brain-like tumor of the testis |
| orchiepididymitis | medical, inflammation of testis and epididymis |
| orchilytic | medical, destructive to testicular tissue |
| orchiocatabasis | medical, the descent of the testis |
| orchiocele | medical, hernia or tumor of the testis |
| orchiomyeloma | medical, myeloma-like tumor of the testis |
| orchioncus | medical, a tumor of the testis |
| orchioneuralgia | medical, neuralgic pain in the testis |
| orchioplasty | surgery, plastic operation on the testis |
| orchiorrhaphy | surgery, suture or fixation of the testis |
| orchioscheocele | medical, scrotal hernia containing the testis |
| orchioscirrhus | medical, hard cancer of the testis |
| ordinatomaculate | entomology, spotted in regular rows |
| ordosite | petrology, a soda-syenite named from the Ordos |
| orellin | chemistry, yellow coloring matter of annatto |
| orendite | petrology, a leucite lava of the Leucite Hills |
| oreodontine | paleontology, of the oreodonts |
| oreodontoid | paleontology, resembling an oreodont |
| oreophasine | ornithology, of the horned-guan subfamily |
| oreotragine | zoology, of the klipspringers (Oreotragus) |
| organochordium | music, an organ combined with a piano |
| organogenist | biology, a student of organ development |
| organonomic | biology, of the laws of organic life |
| organonym | anatomy, the name of an organ |
| organonymal | anatomy, of the naming of organs |
| organonymic | anatomy, of organ nomenclature |
| organophil | biology, having affinity for an organ |
| organophile | biology, drawn to a particular organ |
| organophone | acoustics, device imitating the vocal organs |
| organophonic | acoustics, of organophony |
| orihyperbola | geometry, a species of cubic hyperbola |
| orinasality | phonetics, oral-and-nasal quality |
| orinasally | phonetics, through mouth and nose at once |
| orismologic | of orismology, the explaining of terms |
| orisphere | geometry, the limiting sphere, horosphere |
| oristic | logic, defining, pertaining to definition |
| orlet | architecture, small fillet under the ovolo |
| orleways | heraldry, arranged in the form of an orle |
| orlewise | heraldry, in orle fashion |
| orniscopic | of augury from the flight of birds |
| orniscopist | one who divines by observing birds |
| orniscopy | divination by observing birds |
| ornithobiographical | of the life-histories of birds |
| ornithobiography | description of the life-histories of birds |
| ornithocephalic | zoology, bird-headed |
| ornithocephalous | zoology, having a bird-like head |
| ornithocoprolite | paleontology, fossil bird dung |
| ornithocopros | bird excrement, guano |
| ornithodelph | zoology, a monotreme |
| ornithodelphian | zoology, a monotreme mammal |
| ornithodelphic | zoology, of the monotremes |
| ornithodelphous | zoology, having a bird-like reproductive tract |
| ornithogaean | biogeography, of the New Zealand realm |
| ornithography | descriptive writing about birds |
| ornitholitic | paleontology, of fossil bird remains |
| ornithomania | an obsessive passion for birds |
| ornithomantist | one who divines by means of birds |
The other lists filed alongside this one.
