297 Nouns That End With IUM

Word Definitions Synonyms
actinium (noun) a radioactive element of the actinide series; found in uranium ores Ac, atomic number 89
aecium (noun) fruiting body of some rust fungi bearing chains of aeciospores -
alluvium (noun) clay or silt or gravel carried by rushing streams and deposited where the stream slows down alluvion, alluvial deposit, alluvial sediment
aluminium (noun) a silvery ductile metallic element found primarily in bauxite Al, aluminum, atomic number 13
americium (noun) a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms Am, atomic number 95
ammobium (noun) any plant of the genus Ammobium having yellow flowers and silvery foliage -
ammonium (noun) the ion NH4 derived from ammonia; behaves in many respects like an alkali metal ion ammonium ion
androecium (noun) a male gametoecium -
antheridium (noun) the male sex organ of spore-producing plants; produces antherozoids; equivalent to the anther in flowers -
anthurium (noun) any of various tropical American plants cultivated for their showy foliage and flowers tail-flower, tailflower
apothecium (noun) a cuplike ascocarp in many lichens and ascomycetous fungi -
aquarium (noun) a tank or pool or bowl filled with water for keeping live fish and underwater animals marine museum, fish tank
archaebacterium (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae archaebacteria, archaeobacteria, archeobacteria
archegonium (noun) a female sex organ occurring in mosses, ferns, and most gymnosperms -
archesporium (noun) primitive cell or group of cells from which a mother cell develops archespore
archipallium (noun) the olfactory cortex of the cerebrum paleocortex
armamentarium (noun) the collection of equipment and methods used in the practice of medicine -
aspersorium (noun) the basin or other vessel that holds holy water in Roman Catholic Churches -
aspersorium (noun) a short-handled device with a globe containing a sponge; used for sprinkling holy water aspergill
atrium (noun) any chamber that is connected to other chambers or passageways (especially one of the two upper chambers of the heart) -
atrium (noun) the central area in a building; open to the sky -
auditorium (noun) the area of a theater or concert hall where the audience sits -
bacterium (noun) (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants bacteria
barium (noun) a soft silvery metallic element of the alkali earth group; found in barite atomic number 56, Ba
basidium (noun) a small club-shaped structure typically bearing four basidiospores at the ends of minute projections; unique to basidiomycetes -
bdellium (noun) aromatic gum resin; similar to myrrh -
berkelium (noun) a radioactive transuranic element; discovered by bombarding americium with helium atomic number 97, Bk
beryllium (noun) a light strong brittle grey toxic bivalent metallic element glucinium, atomic number 4, Be
bimillennium (noun) the 2000th anniversary (or the celebration of it) bimillenary
bimillennium (noun) a span of 2000 years bimillenary
bohrium (noun) a transuranic element with atomic number 107 element 107, atomic number 107, Bh
brachium (noun) (biology) a branching or armlike part of an animal -
cadmium (noun) a soft bluish-white ductile malleable toxic bivalent metallic element; occurs in association with zinc ores Cd, atomic number 48
caesium (noun) a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal Cs, cesium, atomic number 55
caladium (noun) any plant of the genus Caladium cultivated for their ornamental foliage variously patterned in white or pink or red -
calcium (noun) a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals Ca, atomic number 20
californium (noun) a radioactive transuranic element; discovered by bombarding curium with alpha particles Cf, atomic number 98
cambium (noun) a formative one-cell layer of tissue between xylem and phloem in most vascular plants that is responsible for secondary growth -
cambium (noun) the inner layer of the periosteum -
cerium (noun) a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group Ce, atomic number 58
cesium (noun) a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal Cs, caesium, atomic number 55
chromium (noun) a hard brittle multivalent metallic element; resistant to corrosion and tarnishing Cr, atomic number 24
cilium (noun) a hairlike projection from the surface of a cell; provides locomotion in free-swimming unicellular organisms -
cilium (noun) any of the short curved hairs that grow from the edges of the eyelids lash, eyelash
cinerarium (noun) a niche for a funeral urn containing the ashes of the cremated dead columbarium
cleistothecium (noun) closed spore-bearing structure of some fungi (especially Aspergillaceae and Erysiphaceae) from which spores are released only by decay or disintegration cleistocarp
clostridium (noun) spindle-shaped bacterial cell especially one swollen at the center by an endospore clostridia
coccidium (noun) parasitic on the digestive epithelium of vertebrates and higher invertebrates eimeria
colloquium (noun) an academic meeting or seminar usually led by a different lecturer and on a different topic at each meeting -
colloquium (noun) an address to an academic meeting or seminar -
collyrium (noun) lotion consisting of a solution used as a cleanser for the eyes eye-lotion, eyewash
columbarium (noun) a birdhouse for pigeons dovecote, columbary
columbarium (noun) a niche for a funeral urn containing the ashes of the cremated dead cinerarium
columbarium (noun) a sepulchral vault or other structure having recesses in the walls to receive cinerary urns -
columbium (noun) a former name for niobium -
compendium (noun) a publication containing a variety of works collection
compendium (noun) a concise but comprehensive summary of a larger work -
condominium (noun) one of the dwelling units in a condominium condo
condominium (noun) housing consisting of a complex of dwelling units (as an apartment house) in which each unit is individually owned -
conidium (noun) an asexually produced fungal spore formed on a conidiophore conidiospore
consortium (noun) an association of companies for some definite purpose pool, syndicate
corium (noun) the deep vascular inner layer of the skin derma, dermis
corynebacterium (noun) any species of the genus Corynebacterium -
cranium (noun) the part of the skull that encloses the brain braincase, brainpan
crematorium (noun) a mortuary where corpses are cremated crematory
crematorium (noun) a furnace where a corpse can be burned and reduced to ashes cremation chamber, crematory
criterium (noun) a bicycle race held on a short course (usually less than 5 km or 3 miles) crit
ctenidium (noun) comb-like respiratory structure serving as the gill of certain mollusks -
curium (noun) a radioactive transuranic metallic element; produced by bombarding plutonium with helium nuclei Cm, atomic number 96
cymatium (noun) (architecture) a molding for a cornice; in profile it is shaped like an S (partly concave and partly convex) cyma
cymbidium (noun) any of various plants of the genus Cymbidium having narrow leaves and a long drooping cluster of numerous showy and variously colored boat-shaped flowers; extensively hybridized and cultivated as houseplants and important florists' flowers cymbid
darmstadtium (noun) a radioactive transuranic element, with atomic number 110 Ds, element 110, atomic number 110
decennium (noun) a period of 10 years decade, decennary
deliquium (noun) a spontaneous loss of consciousness caused by insufficient blood to the brain swoon, syncope, faint
delirium (noun) state of violent mental agitation craze, fury, hysteria, frenzy
delirium (noun) a usually brief state of excitement and mental confusion often accompanied by hallucinations -
delphinium (noun) any plant of the genus Delphinium having palmately divided leaves and showy spikes of variously colored spurred flowers; some contain extremely poisonous substances -
dendrobium (noun) a plant of the genus Dendrobium having stems like cane and usually showy racemose flowers -
deuterium (noun) an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen) heavy hydrogen
diazonium (noun) the univalent cation R-N:N- (where R is an aromatic hydrocarbon); found in salts that are used in manufacturing azo dyes -
dictostylium (noun) any slime mold of the genus Dictostylium -
disequilibrium (noun) loss of equilibrium attributable to an unstable situation in which some forces outweigh others -
domatium (noun) a part of a plant (e.g., a leaf) that has been modified to provide protection for insects or mites or fungi -
dracontium (noun) any plant of the genus Dracontium; strongly malodorous tropical American plants usually with gigantic leaves -
dubnium (noun) a transuranic element with atomic number 105 hahnium, Db, element 105, atomic number 105
dysprosium (noun) a trivalent metallic element of the rare earth group; forms compounds that are highly magnetic Dy, atomic number 66
effluvium (noun) a foul-smelling outflow or vapor (especially a gaseous waste) -
einsteinium (noun) a radioactive transuranic element produced by bombarding plutonium with neutrons E, Es, atomic number 99
emporium (noun) a large retail store organized into departments offering a variety of merchandise; commonly part of a retail chain department store
emunctorium (noun) a white linen cloth which is used to wipe the chalice after each communicant partakes. purificator, purificatorium
encomium (noun) a formal expression of praise paean, panegyric, pean, eulogy
endocardium (noun) the membrane that lines the cavities of the heart and forms part of the heart valves -
endocranium (noun) membrane lining the inside of the skull -
endometrium (noun) (pregnancy) the mucous membrane that lines the uterus; thickens under hormonal control and (if pregnancy does not occur) is shed in menstruation; if pregnancy occurs it is shed along with the placenta at parturition -
endoneurium (noun) delicate connective tissue around individual nerve fibers in nerve -
endothelium (noun) an epithelium of mesoblastic origin; a thin layer of flattened cells that lines the inside of some body cavities -
epicardium (noun) the innermost of the two layers of the pericardium visceral pericardium
epicranium (noun) the muscle and aponeurosis and skin covering the cranium -
epigastrium (noun) the region lying on or over the stomach (just below the sternum) -
epimythium (noun) a moral at the end of a story. -
epithalamium (noun) an ode honoring a bride and bridegroom -
epithelium (noun) membranous tissue covering internal organs and other internal surfaces of the body epithelial tissue
equilibrium (noun) a stable situation in which forces cancel one another -
equilibrium (noun) a chemical reaction and its reverse proceed at equal rates chemical equilibrium
equilibrium (noun) equality of distribution balance, counterbalance, equipoise
equilibrium (noun) a sensory system located in structures of the inner ear that registers the orientation of the head sense of balance, sense of equilibrium, vestibular sense, labyrinthine sense
erbium (noun) a trivalent metallic element of the rare earth group; occurs with yttrium Er, atomic number 68
eubacterium (noun) a large group of bacteria having rigid cell walls; motile types have flagella eubacteria, true bacteria
eulogium (noun) a formal expression of praise for someone who has died recently eulogy
euphonium (noun) a bass horn (brass wind instrument) that is the tenor of the tuba family -
euphorbium (noun) an acrid brown gum resin now used mainly in veterinary medicine gum eurphorbium
europium (noun) a bivalent and trivalent metallic element of the rare earth group Eu, atomic number 63
eusporangium (noun) a sporangium that arises from a group of epidermal cells -
exordium (noun) (rhetoric) the introductory section of an oration or discourse -
fermium (noun) a radioactive transuranic metallic element produced by bombarding plutonium with neutrons atomic number 100, Fm

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