9-letter words that end in um
- coenobium — a monastery or convent
- colchicum — any Eurasian liliaceous plant of the genus Colchicum, such as the autumn crocus
- collegium — (in the former Soviet Union) a board in charge of a department
- colluvium — a mixture of rock fragments from the bases of cliffs
- collyrium — any medicated preparation for the eyes; eyewash
- colosseum — an amphitheatre in Rome built about 75–80 ad
- colostrum — the thin milky secretion from the nipples that precedes and follows true lactation. It consists largely of serum and white blood cells
- columbium — niobium
- combretum — any tree or shrub belonging to the genus Combretum, native mainly to tropical and subtropical Africa and producing attractive flowers
- contagium — the specific virus or other direct cause of any infectious disease
- continuum — A continuum is a set of things on a scale, which have a particular characteristic to different degrees.
- conundrum — A conundrum is a problem or puzzle which is difficult or impossible to solve.
- cormidium — a collection of polyps in a siphonophore
- credendum — an article of faith
- cribellum — a sievelike spinning organ in certain spiders that occurs between the spinnerets
- criterium — a bicycle road race, consisting of numerous laps of a short closed circuit
- ctenidium — one of the comblike respiratory gills of molluscs
- cubiculum — an underground burial chamber in Imperial Rome, such as those found in the catacombs
- cymbidium — a genus, Cymbidium, of subtropical and tropical orchids native to Australia and Asia, having boat-shaped showy flowers
- cystidium — (in certain basidiomycetous fungi) one of the large, inflated, sterile cells growing between the basidia and usually projecting beyond them.
- decennium — decade (sense 2)
- deliquium — loss of consciousness; fainting
- denotatum — (linguistics, philosophy) Something that is denoted; a referent.
- dentalium — any scaphopod mollusc of the genus Dentalium
- depositum — (finance, obsolete) A deposit.
- desmodium — a genus of flowering plant, with usually unobtrusive flowers; many members are considered weeds, such as the beggarweed (Desmodium tortuosum)
- deuterium — a stable isotope of hydrogen, occurring in natural hydrogen (156 parts per million) and in heavy water: used as a tracer in chemistry and biology. Symbol: D or 2H; atomic no: 1; atomic wt: 2.014; boiling pt: –249.7°C
- diacodium — (in pre-modern medicine) a herbal remedy made chiefly from poppies, acting as an opiate and thus used to aid sleep
- diatretum — a type of decorative Roman bowl or cup made of glass
- diazonium — of, consisting of, or containing the group, Ar-N:N-, where Ar is an aryl group
- dichasium — a cymose inflorescence in which each branch bearing a flower gives rise to two other flowering branches, as in the stitchwort
- dilithium — A fictional crystalline mineral in the Star Trek franchise, described as an essential component of anti-matter energy generation systems.
- diverbium — the spoken part of an ancient Roman drama.
- doronicum — any composite plant of the genus Doronicum, comprising the leopard's-banes.
- drepanium — a type of flower cluster shaped like a sickle
- ectropium — Ectropion.
- effluvium — a slight or invisible exhalation or vapor, especially one that is disagreeable or noxious.
- el faiyûm — a city in N Egypt: a site of towns going back at least to the 12th dynasty. Pop: 311 000 (2005 est)
- elaterium — a greenish sediment prepared from the juice of the squirting cucumber, used as a purgative
- endosteum — (biology) A membranous vascular layer of cells which line the medullary cavity of a bone.
- epicedium — Dirge, lament, elegy.
- epilobium — a plant from the genus Epilobium, such as willow-herb
- epimysium — A sheath of fibrous elastic tissue surrounding a muscle.
- equisetum — A plant of a genus that comprises the horsetails.
- euphonium — A valved brass musical instrument resembling a small tuba of tenor pitch, played mainly in military and brass bands.
- excerptum — (from Latin) an excerpt
- fastigium — the highest point of a fever or disease; the period of greatest development of an infection.
- flabellum — a fan, especially one used in religious ceremonies.
- flagellum — A slender threadlike structure, especially a microscopic whiplike appendage that enables many protozoa, bacteria, spermatozoa, etc., to swim.
- flerovium — a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Fl; atomic number: 114.