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297 Nouns That End With IUM

Part of Speech:
Word Definitions Synonyms
pollinium (noun) a coherent mass of pollen grains (as in orchids)
polonium (noun) a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor Synonyms: atomic number 84, Po
potassium (noun) a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite Synonyms: atomic number 19, K
praesidium (noun) a permanent executive committee in socialist countries that has all the powers of some larger legislative body and that acts for it when it is not in session Synonyms: presidium
praetorium (noun) the tent of an ancient Roman general Synonyms: pretorium
praseodymium (noun) a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process Synonyms: atomic number 59, Pr
precordium (noun) the external surface of the body overlying the heart and stomach
premium (noun) the amount that something in scarce supply is valued above its nominal value
(noun) payment or reward (especially from a government) for acts such as catching criminals or killing predatory animals or enlisting in the military Synonyms: bounty
(noun) payment for insurance Synonyms: insurance premium
(noun) a fee charged for exchanging currencies Synonyms: agio, agiotage, exchange premium
(noun) a prize, bonus, or award given as an inducement to purchase products, enter competitions initiated by business interests, etc.
presidium (noun) a permanent executive committee in socialist countries that has all the powers of some larger legislative body and that acts for it when it is not in session Synonyms: praesidium
pretorium (noun) the tent of an ancient Roman general Synonyms: praetorium
primordium (noun) an organ in its earliest stage of development; the foundation for subsequent development Synonyms: anlage
promethium (noun) a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium Synonyms: atomic number 61, Pm
promycelium (noun) the basidium of various fungi
promythium (noun) A section of text that comes before the story.
proscenium (noun) the wall that separates the stage from the auditorium in a modern theater Synonyms: proscenium wall
(noun) the part of a modern theater stage between the curtain and the orchestra (i.e., in front of the curtain) Synonyms: apron, forestage
protactinium (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead Synonyms: atomic number 91, Pa, protoactinium
prothalamium (noun) a song in celebration of a marriage Synonyms: prothalamion
protoactinium (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead Synonyms: atomic number 91, Pa, protactinium
psalterium (noun) the third compartment of the stomach of a ruminant Synonyms: omasum, third stomach
pseudopodium (noun) temporary outgrowth used by some microorganisms as an organ of feeding or locomotion Synonyms: pseudopod
psyllium (noun) plantain of Mediterranean regions whose seeds swell and become gelatinous when moist and are used as a mild laxative Synonyms: fleawort, Plantago psyllium, Spanish psyllium
pterygium (noun) either of two thickened triangular layers of conjunctiva extending from the nasal edge of the eye to the cornea; it arises from irritation of the pinguecula
puerperium (noun) time period following childbirth when the mother's uterus shrinks and the other functional and anatomic changes of pregnancy are resolved
purificatorium (noun) a white linen cloth which is used to wipe the chalice after each communicant partakes. Synonyms: emunctorium, purificator
pycnidium (noun) flask-shaped asexual structure containing conidia
pythium (noun) any fungus of the genus Pythium
pyxidium (noun) fruit of such plants as the plantain; a capsule whose upper part falls off when the seeds are released Synonyms: pyxis
quadrennium (noun) a period of four years
quadrivium (noun) (Middle Ages) a higher division of the curriculum in a medieval university involving arithmetic and music and geometry and astronomy
quinquennium (noun) a period of five years
radiothorium (noun) radioactive isotope of thorium with mass number 228 Synonyms: thorium-228
radium (noun) an intensely radioactive metallic element that occurs in minute amounts in uranium ores Synonyms: atomic number 88, Ra
regnellidium (noun) small latex-containing aquatic fern of southern Brazil Synonyms: Regnellidium diphyllum
rhenium (noun) a rare heavy polyvalent metallic element that resembles manganese chemically and is used in some alloys; is obtained as a by-product in refining molybdenum Synonyms: atomic number 75, Re
rhodium (noun) a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum Synonyms: atomic number 45, Rh
roentgenium (noun) a radioactive transuranic element, with atomic number 111 Synonyms: atomic number 111, element 111, Rg
rubidium (noun) a soft silvery metallic element of the alkali metal group; burns in air and reacts violently in water; occurs in carnallite and lepidolite and pollucite Synonyms: atomic number 37, Rb
ruthenium (noun) a rare polyvalent metallic element of the platinum group; it is found associated with platinum Synonyms: atomic number 44, Ru
rutherfordium (noun) a radioactive transuranic element which has been synthesized Synonyms: atomic number 104, element 104, Rf, unnilquadium, Unq
samarium (noun) a grey lustrous metallic element of the rare earth group; is used in special alloys; occurs in monazite and bastnasite Synonyms: atomic number 62, Sm
sanatarium (noun) a hospital for recuperation or for the treatment of chronic diseases Synonyms: sanatorium, sanitarium
sanatorium (noun) a hospital for recuperation or for the treatment of chronic diseases Synonyms: sanatarium, sanitarium
(noun) pejorative terms for an insane asylum Synonyms: Bedlam, booby hatch, crazy house, cuckoo's nest, funny farm, funny house, loony bin, madhouse, nut house, nuthouse, snake pit
sanitarium (noun) a hospital for recuperation or for the treatment of chronic diseases Synonyms: sanatarium, sanatorium
scandium (noun) a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite Synonyms: atomic number 21, Sc
scholium (noun) a marginal note written by a scholiast (a commentator on ancient or classical literature) Synonyms: scholia
sclerotium (noun) compact usually dark-colored mass of hardened mycelium constituting a vegetative food-storage body in various true fungi; detaches when mature and can give rise to new growth
scolopendrium (noun) a fern thought to resemble a millipede
scriptorium (noun) a room in a monastery that is set aside for writing or copying manuscripts
seaborgium (noun) a transuranic element with atomic number 106 Synonyms: atomic number 106, element 106, Sg
selenium (noun) a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable grey metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite) Synonyms: atomic number 34, Se
sensorium (noun) the areas of the brain that process and register incoming sensory information and make possible the conscious awareness of the world
sericterium (noun) silk-producing gland of insects (especially of a silkworm) or spiders Synonyms: serictery, silk gland
sodium (noun) a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt) Synonyms: atomic number 11, Na
solarium (noun) a room enclosed largely with glass and affording exposure to the sun Synonyms: sun lounge, sun parlor, sun parlour, sun porch, sunporch, sunroom
sporangium (noun) organ containing or producing spores Synonyms: spore case, spore sac
stadium (noun) a large structure for open-air sports or entertainments Synonyms: arena, bowl, sports stadium
strontium (noun) a soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite Synonyms: atomic number 38, Sr
stylopodium (noun) an enlargement at the base of the style in some Umbelliferae
sudatorium (noun) a bathhouse for hot air baths or steam baths Synonyms: sudatory
supercilium (noun) the arch of hair above each eye Synonyms: brow, eyebrow
syconium (noun) the fleshy multiple fruit of the fig consisting of an enlarged hollow receptacle containing numerous fruitlets
symposium (noun) a meeting or conference for the public discussion of some topic especially one in which the participants form an audience and make presentations
syncytium (noun) a mass of cytoplasm containing several nuclei and enclosed in a membrane but no internal cell boundaries (as in muscle fibers)
synovium (noun) a thin membrane in synovial (freely moving) joints that lines the joint capsule and secretes synovial fluid Synonyms: synovial membrane
technetium (noun) a crystalline metallic element not found in nature; occurs as one of the fission products of uranium Synonyms: atomic number 43, Tc
tedium (noun) dullness owing to length or slowness Synonyms: tediousness, tiresomeness
(noun) the feeling of being bored by something tedious Synonyms: boredom, ennui
tellurium (noun) a brittle silver-white metalloid element that is related to selenium and sulfur; it is used in alloys and as a semiconductor; occurs mainly as tellurides in ores of copper and nickel and silver and gold Synonyms: atomic number 52, Te
tentorium (noun) (anatomy) a fold of dura mater that covers the cerebellum and supports the occipital lobes of the cerebrum
terbium (noun) a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite Synonyms: atomic number 65, Tb
terrarium (noun) a vivarium in which selected living plants are kept and observed
tetrasporangium (noun) a sporangium containing four asexual spores
thallium (noun) a soft grey malleable metallic element that resembles tin but discolors on exposure to air; it is highly toxic and is used in rodent and insect poisons; occurs in zinc blende and some iron ores Synonyms: atomic number 81, Tl
thorium (noun) a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands Synonyms: atomic number 90, Th
thulium (noun) a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime Synonyms: atomic number 69, Tm
titanium (noun) a light strong grey lustrous corrosion-resistant metallic element used in strong lightweight alloys (as for airplane parts); the main sources are rutile and ilmenite Synonyms: atomic number 22, Ti
trapezium (noun) the wrist bone on the thumb side of the hand that articulates with the 1st and 2nd metacarpals Synonyms: os trapezium, trapezium bone
(noun) a quadrilateral with no parallel sides
trichodesmium (noun) large colonial bacterium common in tropical open-ocean waters; important in carbon and nitrogen fixation
triclinium (noun) a dining table with couches along three sides in ancient Rome
(noun) a dining room (especially a dining room containing a dining table with couches along three sides)
trillium (noun) any liliaceous plant of the genus Trillium having a whorl of three leaves at the top of the stem with a single three-petaled flower Synonyms: wake-robin, wood lily
tritium (noun) a radioactive isotope of hydrogen; atoms of tritium have three times the mass of ordinary hydrogen atoms
trivium (noun) (Middle Ages) an introductory curriculum at a medieval university involving grammar and logic and rhetoric; considered to be a triple way to eloquence
unnilquadium (noun) a radioactive transuranic element which has been synthesized Synonyms: atomic number 104, element 104, Rf, rutherfordium, Unq
ununbium (noun) a radioactive transuranic element, with atomic number 112 Synonyms: atomic number 112, element 112, Uub
ununhexium (noun) a radioactive transuranic element, with atomic number 116 Synonyms: atomic number 116, element 116, Uuh
ununpentium (noun) a radioactive transuranic element, with atomic number 115 Synonyms: atomic number 115, element 115, Uup
ununquadium (noun) a radioactive transuranic element, with atomic number 114 Synonyms: atomic number 114, element 114, Uuq
ununtrium (noun) a radioactive transuranic element, with atomic number 113 Synonyms: atomic number 113, element 113, Uut
uranium (noun) a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons Synonyms: atomic number 92, U
uropygium (noun) posterior part of a bird's body from which the tail feathers grow
vanadium (noun) a soft silvery white toxic metallic element used in steel alloys; it occurs in several complex minerals including carnotite and vanadinite Synonyms: atomic number 23, V
verticillium (noun) a fungus of the genus Verticillium
vitellarium (noun) A modified part of the ovary that in many flatworms and rotifers produces yolk-filled cells serving to nourish the true eggs.
vivarium (noun) an indoor enclosure for keeping and raising living animals and plants and observing them under natural conditions
ytterbium (noun) a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime Synonyms: atomic number 70, Yb
yttrium (noun) a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys Synonyms: atomic number 39, Y
zirconium (noun) a lustrous grey strong metallic element resembling titanium; it is used in nuclear reactors as a neutron absorber; it occurs in baddeleyite but is obtained chiefly from zircon Synonyms: atomic number 40, Zr
zoarium (noun) a colony of zooids.

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